From 82740688dfe50dcbe986e4663a007baaec3f4357 Mon Sep 17 00:00:00 2001
From: Qiaoqiao Zhang <55688292+qiaozha@users.noreply.github.com>
Date: Tue, 20 Oct 2020 11:56:19 +0800
Subject: [PATCH] bump-m4-version (#97)

---
 README.md                                     |    2 +-
 package.json                                  |    2 +-
 ...icommon-000010-prename-pre-simplified.yaml |    7 +
 .../output/clicommon-000010-prename-pre.yaml  |  213 ++-
 ...common-000020-prename-post-simplified.yaml |   21 +
 .../output/clicommon-000020-prename-post.yaml |  227 ++-
 ...modeler-post-processor-pre-simplified.yaml |   21 +
 ...mon-000030-modeler-post-processor-pre.yaml |  227 ++-
 ...odeler-post-processor-post-simplified.yaml |   28 +
 ...on-000040-modeler-post-processor-post.yaml |  234 ++-
 ...mmon-000050-m4-flatten-pre-simplified.yaml |   28 +
 .../clicommon-000050-m4-flatten-pre.yaml      |  234 ++-
 ...000060-split-operation-pre-simplified.yaml |   28 +
 .../clicommon-000060-split-operation-pre.yaml |  234 ++-
 ...00070-split-operation-post-simplified.yaml |   28 +
 ...clicommon-000070-split-operation-post.yaml |  234 ++-
 ...mon-000080-m4-flatten-post-simplified.yaml |   28 +
 .../clicommon-000080-m4-flatten-post.yaml     |  234 ++-
 ...-000090-complex-marker-pre-simplified.yaml |   28 +
 .../clicommon-000090-complex-marker-pre.yaml  |  234 ++-
 ...000100-complex-marker-post-simplified.yaml |   28 +
 .../clicommon-000100-complex-marker-post.yaml |  234 ++-
 ...icommon-000110-m4namer-pre-simplified.yaml |   28 +
 .../output/clicommon-000110-m4namer-pre.yaml  |  234 ++-
 ...common-000120-m4namer-post-simplified.yaml |   35 +
 .../output/clicommon-000120-m4namer-post.yaml |  241 ++-
 ...mon-000130-flatten-set-pre-simplified.yaml |   28 +
 .../clicommon-000130-flatten-set-pre.yaml     |  234 ++-
 ...on-000140-flatten-set-post-simplified.yaml |   28 +
 .../clicommon-000140-flatten-set-post.yaml    |  234 ++-
 ...icommon-000150-flatten-pre-simplified.yaml |   28 +
 .../output/clicommon-000150-flatten-pre.yaml  |  234 ++-
 ...common-000160-flatten-post-simplified.yaml |   28 +
 .../output/clicommon-000160-flatten-post.yaml |  234 ++-
 ...00170-poly-as-resource-pre-simplified.yaml |   28 +
 ...clicommon-000170-poly-as-resource-pre.yaml |  234 ++-
 ...0180-poly-as-resource-post-simplified.yaml |   28 +
 ...licommon-000180-poly-as-resource-post.yaml |  234 ++-
 ...icommon-000190-flatten-pre-simplified.yaml |   28 +
 .../output/clicommon-000190-flatten-pre.yaml  |  234 ++-
 ...common-000200-flatten-post-simplified.yaml |   28 +
 .../output/clicommon-000200-flatten-post.yaml |  234 ++-
 ...common-000210-modifier-pre-simplified.yaml |   28 +
 .../output/clicommon-000210-modifier-pre.yaml |  234 ++-
 ...ommon-000220-modifier-post-simplified.yaml |   28 +
 .../clicommon-000220-modifier-post.yaml       |  234 ++-
 ...clicommon-000230-namer-pre-simplified.yaml |   28 +
 .../output/clicommon-000230-namer-pre.yaml    |  234 ++-
 ...licommon-000240-namer-post-simplified.yaml |   35 +
 .../output/clicommon-000240-namer-post.yaml   |  258 +++-
 .../clicommon-000250-test-pre-simplified.yaml |   35 +
 .../output/clicommon-000250-test-pre.yaml     |  258 +++-
 ...clicommon-000260-test-post-simplified.yaml |   35 +
 .../output/clicommon-000260-test-post.yaml    |  258 +++-
 ...-000270-complex-marker-pre-simplified.yaml |   35 +
 .../clicommon-000270-complex-marker-pre.yaml  |  258 +++-
 ...000280-complex-marker-post-simplified.yaml |   35 +
 .../clicommon-000280-complex-marker-post.yaml |  258 +++-
 ...icommon-000010-prename-pre-simplified.yaml |   35 +
 .../output/clicommon-000010-prename-pre.yaml  | 1094 ++++++++++----
 ...common-000020-prename-post-simplified.yaml |  105 ++
 .../output/clicommon-000020-prename-post.yaml | 1164 +++++++++++----
 ...modeler-post-processor-pre-simplified.yaml |  105 ++
 ...mon-000030-modeler-post-processor-pre.yaml | 1164 +++++++++++----
 ...odeler-post-processor-post-simplified.yaml |  140 ++
 ...on-000040-modeler-post-processor-post.yaml | 1199 +++++++++++----
 ...mmon-000050-m4-flatten-pre-simplified.yaml |  140 ++
 .../clicommon-000050-m4-flatten-pre.yaml      | 1199 +++++++++++----
 ...000060-split-operation-pre-simplified.yaml |  140 ++
 .../clicommon-000060-split-operation-pre.yaml | 1199 +++++++++++----
 ...00070-split-operation-post-simplified.yaml |  140 ++
 ...clicommon-000070-split-operation-post.yaml | 1199 +++++++++++----
 ...mon-000080-m4-flatten-post-simplified.yaml |  140 ++
 .../clicommon-000080-m4-flatten-post.yaml     | 1199 +++++++++++----
 ...-000090-complex-marker-pre-simplified.yaml |  140 ++
 .../clicommon-000090-complex-marker-pre.yaml  | 1199 +++++++++++----
 ...000100-complex-marker-post-simplified.yaml |  140 ++
 .../clicommon-000100-complex-marker-post.yaml | 1199 +++++++++++----
 ...icommon-000110-m4namer-pre-simplified.yaml |  140 ++
 .../output/clicommon-000110-m4namer-pre.yaml  | 1199 +++++++++++----
 ...common-000120-m4namer-post-simplified.yaml |  175 +++
 .../output/clicommon-000120-m4namer-post.yaml | 1234 ++++++++++++----
 ...mon-000130-flatten-set-pre-simplified.yaml |  140 ++
 .../clicommon-000130-flatten-set-pre.yaml     | 1199 +++++++++++----
 ...on-000140-flatten-set-post-simplified.yaml |  140 ++
 .../clicommon-000140-flatten-set-post.yaml    | 1199 +++++++++++----
 ...icommon-000150-flatten-pre-simplified.yaml |  140 ++
 .../output/clicommon-000150-flatten-pre.yaml  | 1199 +++++++++++----
 ...common-000160-flatten-post-simplified.yaml |  140 ++
 .../output/clicommon-000160-flatten-post.yaml | 1199 +++++++++++----
 ...00170-poly-as-resource-pre-simplified.yaml |  140 ++
 ...clicommon-000170-poly-as-resource-pre.yaml | 1199 +++++++++++----
 ...0180-poly-as-resource-post-simplified.yaml |  140 ++
 ...licommon-000180-poly-as-resource-post.yaml | 1199 +++++++++++----
 ...icommon-000190-flatten-pre-simplified.yaml |  140 ++
 .../output/clicommon-000190-flatten-pre.yaml  | 1199 +++++++++++----
 ...common-000200-flatten-post-simplified.yaml |  140 ++
 .../output/clicommon-000200-flatten-post.yaml | 1199 +++++++++++----
 ...common-000210-modifier-pre-simplified.yaml |  140 ++
 .../output/clicommon-000210-modifier-pre.yaml | 1199 +++++++++++----
 ...ommon-000220-modifier-post-simplified.yaml |  140 ++
 .../clicommon-000220-modifier-post.yaml       | 1199 +++++++++++----
 ...clicommon-000230-namer-pre-simplified.yaml |  140 ++
 .../output/clicommon-000230-namer-pre.yaml    | 1199 +++++++++++----
 ...licommon-000240-namer-post-simplified.yaml |  175 +++
 .../output/clicommon-000240-namer-post.yaml   | 1307 +++++++++++++----
 .../clicommon-000250-test-pre-simplified.yaml |  175 +++
 .../output/clicommon-000250-test-pre.yaml     | 1307 +++++++++++++----
 ...clicommon-000260-test-post-simplified.yaml |  175 +++
 .../output/clicommon-000260-test-post.yaml    | 1307 +++++++++++++----
 ...-000270-complex-marker-pre-simplified.yaml |  175 +++
 .../clicommon-000270-complex-marker-pre.yaml  | 1307 +++++++++++++----
 ...000280-complex-marker-post-simplified.yaml |  175 +++
 .../clicommon-000280-complex-marker-post.yaml | 1307 +++++++++++++----
 ...icommon-000010-prename-pre-simplified.yaml |   18 +
 .../output/clicommon-000010-prename-pre.yaml  |  502 +++++--
 ...common-000020-prename-post-simplified.yaml |   54 +
 .../output/clicommon-000020-prename-post.yaml |  538 +++++--
 ...modeler-post-processor-pre-simplified.yaml |   54 +
 ...mon-000030-modeler-post-processor-pre.yaml |  538 +++++--
 ...odeler-post-processor-post-simplified.yaml |   72 +
 ...on-000040-modeler-post-processor-post.yaml |  556 +++++--
 ...mmon-000050-m4-flatten-pre-simplified.yaml |   72 +
 .../clicommon-000050-m4-flatten-pre.yaml      |  556 +++++--
 ...000060-split-operation-pre-simplified.yaml |   72 +
 .../clicommon-000060-split-operation-pre.yaml |  556 +++++--
 ...00070-split-operation-post-simplified.yaml |   72 +
 ...clicommon-000070-split-operation-post.yaml |  556 +++++--
 ...mon-000080-m4-flatten-post-simplified.yaml |   72 +
 .../clicommon-000080-m4-flatten-post.yaml     |  556 +++++--
 ...-000090-complex-marker-pre-simplified.yaml |   72 +
 .../clicommon-000090-complex-marker-pre.yaml  |  556 +++++--
 ...000100-complex-marker-post-simplified.yaml |   72 +
 .../clicommon-000100-complex-marker-post.yaml |  556 +++++--
 ...icommon-000110-m4namer-pre-simplified.yaml |   72 +
 .../output/clicommon-000110-m4namer-pre.yaml  |  556 +++++--
 ...common-000120-m4namer-post-simplified.yaml |   90 ++
 .../output/clicommon-000120-m4namer-post.yaml |  574 ++++++--
 ...mon-000130-flatten-set-pre-simplified.yaml |   72 +
 .../clicommon-000130-flatten-set-pre.yaml     |  556 +++++--
 ...on-000140-flatten-set-post-simplified.yaml |   72 +
 .../clicommon-000140-flatten-set-post.yaml    |  556 +++++--
 ...icommon-000150-flatten-pre-simplified.yaml |   72 +
 .../output/clicommon-000150-flatten-pre.yaml  |  556 +++++--
 ...common-000160-flatten-post-simplified.yaml |   72 +
 .../output/clicommon-000160-flatten-post.yaml |  556 +++++--
 ...00170-poly-as-resource-pre-simplified.yaml |   72 +
 ...clicommon-000170-poly-as-resource-pre.yaml |  556 +++++--
 ...0180-poly-as-resource-post-simplified.yaml |   72 +
 ...licommon-000180-poly-as-resource-post.yaml |  556 +++++--
 ...icommon-000190-flatten-pre-simplified.yaml |   72 +
 .../output/clicommon-000190-flatten-pre.yaml  |  556 +++++--
 ...common-000200-flatten-post-simplified.yaml |   72 +
 .../output/clicommon-000200-flatten-post.yaml |  556 +++++--
 ...common-000210-modifier-pre-simplified.yaml |   72 +
 .../output/clicommon-000210-modifier-pre.yaml |  556 +++++--
 ...ommon-000220-modifier-post-simplified.yaml |   72 +
 .../clicommon-000220-modifier-post.yaml       |  556 +++++--
 ...clicommon-000230-namer-pre-simplified.yaml |   72 +
 .../output/clicommon-000230-namer-pre.yaml    |  556 +++++--
 ...licommon-000240-namer-post-simplified.yaml |   90 ++
 .../output/clicommon-000240-namer-post.yaml   |  613 ++++++--
 .../clicommon-000250-test-pre-simplified.yaml |   90 ++
 .../output/clicommon-000250-test-pre.yaml     |  613 ++++++--
 ...clicommon-000260-test-post-simplified.yaml |   90 ++
 .../output/clicommon-000260-test-post.yaml    |  613 ++++++--
 ...-000270-complex-marker-pre-simplified.yaml |   90 ++
 .../clicommon-000270-complex-marker-pre.yaml  |  613 ++++++--
 ...000280-complex-marker-post-simplified.yaml |   90 ++
 .../clicommon-000280-complex-marker-post.yaml |  613 ++++++--
 170 files changed, 49375 insertions(+), 13806 deletions(-)

diff --git a/README.md b/README.md
index 33eee0e..ea4a73b 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ See documentation [here](doc/00-overview.md)
 
 ``` yaml
 use-extension:
-  "@autorest/modelerfour": "4.15.378"
+  "@autorest/modelerfour": "4.15.421"
 
 pipeline-model: v3
 
diff --git a/package.json b/package.json
index 9d89ef3..22e1ee8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@autorest/clicommon",
-    "version": "0.5.2",
+    "version": "0.5.3",
     "description": "Autorest Azure Cli Common Module",
     "main": "dist/index.js",
     "engines": {
diff --git a/test/scenarios/attestation/output/clicommon-000010-prename-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000010-prename-pre-simplified.yaml
index cffe6c3..a0c974d 100644
--- a/test/scenarios/attestation/output/clicommon-000010-prename-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000010-prename-pre-simplified.yaml
@@ -6,6 +6,7 @@ operationGroups:
           parameters:
             - parameterName: $host(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
+            - parameterName[0]: accept(Accept^constant)
     - operationGroupName: AttestationProviders
       operations:
         - operationName: Get
@@ -15,6 +16,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: providerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Create
           parameters:
             - parameterName: $host(string^string)
@@ -24,6 +26,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
             - parameterName[0]: creationParams(AttestationServiceCreationParams^object)
               bodySchema: AttestationServiceCreationParams
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Update
           parameters:
             - parameterName: $host(string^string)
@@ -33,6 +36,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
             - parameterName[0]: updateParams(AttestationServicePatchParams^object)
               bodySchema: AttestationServicePatchParams
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Delete
           parameters:
             - parameterName: $host(string^string)
@@ -40,17 +44,20 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: providerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: List
           parameters:
             - parameterName: $host(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
             - parameterName: subscriptionId(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: ListByResourceGroup
           parameters:
             - parameterName: $host(string^string)
             - parameterName: resourceGroupName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
             - parameterName: subscriptionId(string^string)
+            - parameterName[0]: accept(Accept^constant)
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000010-prename-pre.yaml b/test/scenarios/attestation/output/clicommon-000010-prename-pre.yaml
index f97302d..9c2978f 100644
--- a/test/scenarios/attestation/output/clicommon-000010-prename-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000010-prename-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -396,11 +396,20 @@ schemas:
           name: ApiVersion-2018-09-01-preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResource-tags
@@ -409,7 +418,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServiceCreationParams-tags
@@ -418,14 +426,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServicePatchParams-tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -528,7 +535,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -741,7 +748,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1049,7 +1056,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1073,7 +1080,7 @@ schemas:
           description: Parameters for patching an attestation service instance
           namespace: ''
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1110,7 +1117,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1162,7 +1169,21 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1173,7 +1194,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1186,7 +1207,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1240,9 +1261,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1253,7 +1274,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1267,7 +1288,21 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1277,8 +1312,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1293,7 +1328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1337,9 +1372,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1350,7 +1385,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1365,8 +1400,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1377,8 +1412,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1392,8 +1439,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1420,7 +1467,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1479,9 +1526,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1492,7 +1539,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1507,8 +1554,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1519,8 +1566,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1534,8 +1593,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1550,7 +1609,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1599,9 +1658,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1612,7 +1671,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1626,7 +1685,21 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1636,8 +1709,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1664,7 +1737,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1702,9 +1775,23 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1715,7 +1802,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1728,7 +1815,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1771,8 +1858,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1784,9 +1871,23 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1796,9 +1897,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1811,7 +1912,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000020-prename-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000020-prename-post-simplified.yaml
index ffef407..6dfaf53 100644
--- a/test/scenarios/attestation/output/clicommon-000020-prename-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000020-prename-post-simplified.yaml
@@ -14,6 +14,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: AttestationProviders
       cli:
         cliKey: AttestationProviders
@@ -37,6 +40,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Create
           cli:
             cliKey: Create
@@ -60,6 +66,9 @@ operationGroups:
               cli:
                 cliKey: creationParams
               bodySchema: AttestationServiceCreationParams
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Update
           cli:
             cliKey: Update
@@ -83,6 +92,9 @@ operationGroups:
               cli:
                 cliKey: updateParams
               bodySchema: AttestationServicePatchParams
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -102,6 +114,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-09-01-preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: List
           cli:
             cliKey: List
@@ -115,6 +130,9 @@ operationGroups:
             - parameterName: subscriptionId(string^string)
               cli:
                 cliKey: subscriptionId
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -131,6 +149,9 @@ operationGroups:
             - parameterName: subscriptionId(string^string)
               cli:
                 cliKey: subscriptionId
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000020-prename-post.yaml b/test/scenarios/attestation/output/clicommon-000020-prename-post.yaml
index 3a46e03..a492c23 100644
--- a/test/scenarios/attestation/output/clicommon-000020-prename-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000020-prename-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -404,11 +404,20 @@ schemas:
           name: ApiVersion-2018-09-01-preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResource-tags
@@ -417,7 +426,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServiceCreationParams-tags
@@ -426,14 +434,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServicePatchParams-tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -556,7 +563,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -805,7 +812,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1167,7 +1174,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1195,7 +1202,7 @@ schemas:
         cli:
           cliKey: AttestationServicePatchParams
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1236,7 +1243,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1294,7 +1301,23 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1305,7 +1328,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1318,7 +1341,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1376,9 +1399,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1391,7 +1414,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1407,7 +1430,23 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1417,8 +1456,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1433,7 +1472,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1479,9 +1518,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1494,7 +1533,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1511,8 +1550,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1525,8 +1564,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1540,8 +1593,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1568,7 +1621,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1629,9 +1682,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1644,7 +1697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1661,8 +1714,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1675,8 +1728,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1690,8 +1757,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1706,7 +1773,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1757,9 +1824,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1772,7 +1839,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1788,7 +1855,23 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1798,8 +1881,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1826,7 +1909,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1866,9 +1949,25 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,7 +1978,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1892,7 +1991,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1937,8 +2036,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1952,9 +2051,25 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1964,9 +2079,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1979,7 +2094,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
index 13a469d..1133483 100644
--- a/test/scenarios/attestation/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
@@ -14,6 +14,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_09_01_preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -37,6 +40,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_09_01_preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create
           cli:
             cliKey: Create
@@ -60,6 +66,9 @@ operationGroups:
               cli:
                 cliKey: creationParams
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: update
           cli:
             cliKey: Update
@@ -83,6 +92,9 @@ operationGroups:
               cli:
                 cliKey: updateParams
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: delete
           cli:
             cliKey: Delete
@@ -102,6 +114,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_09_01_preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: list
           cli:
             cliKey: List
@@ -115,6 +130,9 @@ operationGroups:
             - parameterName: SubscriptionId(string^string)
               cli:
                 cliKey: subscriptionId
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -131,6 +149,9 @@ operationGroups:
             - parameterName: SubscriptionId(string^string)
               cli:
                 cliKey: subscriptionId
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000030-modeler-post-processor-pre.yaml b/test/scenarios/attestation/output/clicommon-000030-modeler-post-processor-pre.yaml
index d7c553f..f47d58b 100644
--- a/test/scenarios/attestation/output/clicommon-000030-modeler-post-processor-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000030-modeler-post-processor-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -404,11 +404,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -417,7 +426,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -426,14 +434,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -556,7 +563,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -805,7 +812,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1167,7 +1174,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1195,7 +1202,7 @@ schemas:
         cli:
           cliKey: AttestationServicePatchParams
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1236,7 +1243,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1294,7 +1301,23 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1305,7 +1328,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1318,7 +1341,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1376,9 +1399,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1391,7 +1414,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1407,7 +1430,23 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1417,8 +1456,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1433,7 +1472,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1479,9 +1518,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1494,7 +1533,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1511,8 +1550,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1525,8 +1564,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1540,8 +1593,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1568,7 +1621,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1629,9 +1682,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1644,7 +1697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1661,8 +1714,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1675,8 +1728,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1690,8 +1757,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1706,7 +1773,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1757,9 +1824,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1772,7 +1839,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1788,7 +1855,23 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1798,8 +1881,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1826,7 +1909,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1866,9 +1949,25 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,7 +1978,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1892,7 +1991,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1937,8 +2036,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1952,9 +2051,25 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1964,9 +2079,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1979,7 +2094,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000040-modeler-post-processor-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
index 38d3ff9..bfe3776 100644
--- a/test/scenarios/attestation/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000040-modeler-post-processor-post.yaml b/test/scenarios/attestation/output/clicommon-000040-modeler-post-processor-post.yaml
index 1e2c020..a020c02 100644
--- a/test/scenarios/attestation/output/clicommon-000040-modeler-post-processor-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000040-modeler-post-processor-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -421,7 +430,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -430,14 +438,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -570,7 +577,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -837,7 +844,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1226,7 +1233,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1256,7 +1263,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1299,7 +1306,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1360,7 +1367,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1371,7 +1395,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1384,7 +1408,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1444,9 +1468,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1460,7 +1484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1477,7 +1501,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1487,8 +1528,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1503,7 +1544,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1550,9 +1591,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1566,7 +1607,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1584,8 +1625,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1599,8 +1640,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1614,8 +1670,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1642,7 +1698,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1704,9 +1760,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1720,7 +1776,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1738,8 +1794,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1753,8 +1809,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1768,8 +1839,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1784,7 +1855,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1836,9 +1907,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1852,7 +1923,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1869,7 +1940,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,8 +1967,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1907,7 +1995,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1948,9 +2036,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1961,7 +2066,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1974,7 +2079,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2020,8 +2125,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2036,9 +2141,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2048,9 +2170,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2063,7 +2185,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000050-m4-flatten-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000050-m4-flatten-pre-simplified.yaml
index 38d3ff9..bfe3776 100644
--- a/test/scenarios/attestation/output/clicommon-000050-m4-flatten-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000050-m4-flatten-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000050-m4-flatten-pre.yaml b/test/scenarios/attestation/output/clicommon-000050-m4-flatten-pre.yaml
index 1e2c020..a020c02 100644
--- a/test/scenarios/attestation/output/clicommon-000050-m4-flatten-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000050-m4-flatten-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -421,7 +430,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -430,14 +438,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -570,7 +577,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -837,7 +844,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1226,7 +1233,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1256,7 +1263,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1299,7 +1306,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1360,7 +1367,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1371,7 +1395,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1384,7 +1408,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1444,9 +1468,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1460,7 +1484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1477,7 +1501,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1487,8 +1528,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1503,7 +1544,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1550,9 +1591,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1566,7 +1607,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1584,8 +1625,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1599,8 +1640,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1614,8 +1670,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1642,7 +1698,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1704,9 +1760,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1720,7 +1776,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1738,8 +1794,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1753,8 +1809,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1768,8 +1839,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1784,7 +1855,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1836,9 +1907,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1852,7 +1923,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1869,7 +1940,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,8 +1967,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1907,7 +1995,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1948,9 +2036,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1961,7 +2066,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1974,7 +2079,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2020,8 +2125,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2036,9 +2141,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2048,9 +2170,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2063,7 +2185,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000060-split-operation-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000060-split-operation-pre-simplified.yaml
index 38d3ff9..bfe3776 100644
--- a/test/scenarios/attestation/output/clicommon-000060-split-operation-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000060-split-operation-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000060-split-operation-pre.yaml b/test/scenarios/attestation/output/clicommon-000060-split-operation-pre.yaml
index 1e2c020..a020c02 100644
--- a/test/scenarios/attestation/output/clicommon-000060-split-operation-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000060-split-operation-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -421,7 +430,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -430,14 +438,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -570,7 +577,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -837,7 +844,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1226,7 +1233,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1256,7 +1263,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1299,7 +1306,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1360,7 +1367,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1371,7 +1395,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1384,7 +1408,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1444,9 +1468,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1460,7 +1484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1477,7 +1501,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1487,8 +1528,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1503,7 +1544,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1550,9 +1591,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1566,7 +1607,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1584,8 +1625,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1599,8 +1640,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1614,8 +1670,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1642,7 +1698,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1704,9 +1760,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1720,7 +1776,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1738,8 +1794,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1753,8 +1809,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1768,8 +1839,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1784,7 +1855,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1836,9 +1907,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1852,7 +1923,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1869,7 +1940,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,8 +1967,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1907,7 +1995,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1948,9 +2036,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1961,7 +2066,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1974,7 +2079,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2020,8 +2125,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2036,9 +2141,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2048,9 +2170,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2063,7 +2185,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000070-split-operation-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000070-split-operation-post-simplified.yaml
index 38d3ff9..bfe3776 100644
--- a/test/scenarios/attestation/output/clicommon-000070-split-operation-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000070-split-operation-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000070-split-operation-post.yaml b/test/scenarios/attestation/output/clicommon-000070-split-operation-post.yaml
index 1e2c020..a020c02 100644
--- a/test/scenarios/attestation/output/clicommon-000070-split-operation-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000070-split-operation-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -421,7 +430,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -430,14 +438,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -570,7 +577,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -837,7 +844,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1226,7 +1233,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1256,7 +1263,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1299,7 +1306,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1360,7 +1367,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1371,7 +1395,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1384,7 +1408,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1444,9 +1468,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1460,7 +1484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1477,7 +1501,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1487,8 +1528,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1503,7 +1544,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1550,9 +1591,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1566,7 +1607,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1584,8 +1625,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1599,8 +1640,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1614,8 +1670,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1642,7 +1698,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1704,9 +1760,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1720,7 +1776,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1738,8 +1794,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1753,8 +1809,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1768,8 +1839,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1784,7 +1855,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1836,9 +1907,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1852,7 +1923,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1869,7 +1940,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,8 +1967,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1907,7 +1995,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1948,9 +2036,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1961,7 +2066,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1974,7 +2079,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2020,8 +2125,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2036,9 +2141,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2048,9 +2170,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2063,7 +2185,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000080-m4-flatten-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000080-m4-flatten-post-simplified.yaml
index 38d3ff9..bfe3776 100644
--- a/test/scenarios/attestation/output/clicommon-000080-m4-flatten-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000080-m4-flatten-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000080-m4-flatten-post.yaml b/test/scenarios/attestation/output/clicommon-000080-m4-flatten-post.yaml
index 1e2c020..a020c02 100644
--- a/test/scenarios/attestation/output/clicommon-000080-m4-flatten-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000080-m4-flatten-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -421,7 +430,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -430,14 +438,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -570,7 +577,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -837,7 +844,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1226,7 +1233,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1256,7 +1263,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1299,7 +1306,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1360,7 +1367,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1371,7 +1395,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1384,7 +1408,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1444,9 +1468,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1460,7 +1484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1477,7 +1501,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1487,8 +1528,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1503,7 +1544,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1550,9 +1591,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1566,7 +1607,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1584,8 +1625,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1599,8 +1640,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1614,8 +1670,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1642,7 +1698,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1704,9 +1760,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1720,7 +1776,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1738,8 +1794,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1753,8 +1809,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1768,8 +1839,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1784,7 +1855,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1836,9 +1907,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1852,7 +1923,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1869,7 +1940,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,8 +1967,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1907,7 +1995,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1948,9 +2036,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1961,7 +2066,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1974,7 +2079,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2020,8 +2125,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2036,9 +2141,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2048,9 +2170,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2063,7 +2185,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000090-complex-marker-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000090-complex-marker-pre-simplified.yaml
index 38d3ff9..bfe3776 100644
--- a/test/scenarios/attestation/output/clicommon-000090-complex-marker-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000090-complex-marker-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000090-complex-marker-pre.yaml b/test/scenarios/attestation/output/clicommon-000090-complex-marker-pre.yaml
index 1e2c020..a020c02 100644
--- a/test/scenarios/attestation/output/clicommon-000090-complex-marker-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000090-complex-marker-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -421,7 +430,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -430,14 +438,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -570,7 +577,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -837,7 +844,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1226,7 +1233,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1256,7 +1263,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1299,7 +1306,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1360,7 +1367,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1371,7 +1395,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1384,7 +1408,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1444,9 +1468,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1460,7 +1484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1477,7 +1501,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1487,8 +1528,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1503,7 +1544,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1550,9 +1591,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1566,7 +1607,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1584,8 +1625,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1599,8 +1640,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1614,8 +1670,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1642,7 +1698,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1704,9 +1760,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1720,7 +1776,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1738,8 +1794,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1753,8 +1809,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1768,8 +1839,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1784,7 +1855,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1836,9 +1907,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1852,7 +1923,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1869,7 +1940,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,8 +1967,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1907,7 +1995,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1948,9 +2036,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1961,7 +2066,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1974,7 +2079,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2020,8 +2125,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2036,9 +2141,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2048,9 +2170,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2063,7 +2185,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000100-complex-marker-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000100-complex-marker-post-simplified.yaml
index 1423e90..d934ba8 100644
--- a/test/scenarios/attestation/output/clicommon-000100-complex-marker-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000100-complex-marker-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000100-complex-marker-post.yaml b/test/scenarios/attestation/output/clicommon-000100-complex-marker-post.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000100-complex-marker-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000100-complex-marker-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000110-m4namer-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000110-m4namer-pre-simplified.yaml
index 38d3ff9..bfe3776 100644
--- a/test/scenarios/attestation/output/clicommon-000110-m4namer-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000110-m4namer-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000110-m4namer-pre.yaml b/test/scenarios/attestation/output/clicommon-000110-m4namer-pre.yaml
index 1e2c020..a020c02 100644
--- a/test/scenarios/attestation/output/clicommon-000110-m4namer-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000110-m4namer-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -421,7 +430,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -430,14 +438,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -570,7 +577,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -837,7 +844,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1226,7 +1233,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1256,7 +1263,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1299,7 +1306,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1360,7 +1367,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1371,7 +1395,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1384,7 +1408,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1444,9 +1468,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1460,7 +1484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1477,7 +1501,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1487,8 +1528,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1503,7 +1544,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1550,9 +1591,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1566,7 +1607,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1584,8 +1625,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1599,8 +1640,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1614,8 +1670,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1642,7 +1698,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1704,9 +1760,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1720,7 +1776,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1738,8 +1794,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1753,8 +1809,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1768,8 +1839,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1784,7 +1855,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1836,9 +1907,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1852,7 +1923,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1869,7 +1940,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1879,8 +1967,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1907,7 +1995,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1948,9 +2036,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1961,7 +2066,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -1974,7 +2079,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2020,8 +2125,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2036,9 +2141,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2048,9 +2170,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2063,7 +2185,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000120-m4namer-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000120-m4namer-post-simplified.yaml
index da6ec35..11f035d 100644
--- a/test/scenarios/attestation/output/clicommon-000120-m4namer-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000120-m4namer-post-simplified.yaml
@@ -22,6 +22,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: AttestationProviders
       cli:
         cliKey: AttestationProviders
@@ -59,6 +64,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -96,6 +106,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: AttestationServiceCreationParams
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +148,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: AttestationServicePatchParams
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -164,6 +184,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -185,6 +210,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -211,6 +241,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000120-m4namer-post.yaml b/test/scenarios/attestation/output/clicommon-000120-m4namer-post.yaml
index 4675c1c..bd14dac 100644
--- a/test/scenarios/attestation/output/clicommon-000120-m4namer-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000120-m4namer-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -412,11 +412,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -425,7 +434,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServiceCreationParamsTags
@@ -434,14 +442,13 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServicePatchParamsTags
           description: The tags that will be assigned to the attestation service instance.
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -584,7 +591,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -869,7 +876,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1285,7 +1292,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1317,7 +1324,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
           cliPath: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1362,7 +1369,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1426,7 +1433,25 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1437,7 +1462,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1450,7 +1475,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1512,9 +1537,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1529,7 +1554,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1547,7 +1572,25 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1557,8 +1600,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1573,7 +1616,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1621,9 +1664,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1638,7 +1681,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1657,8 +1700,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1673,8 +1716,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1688,8 +1747,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1716,7 +1775,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1779,9 +1838,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1796,7 +1855,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1815,8 +1874,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1831,8 +1890,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1846,8 +1921,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1862,7 +1937,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1915,9 +1990,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1932,7 +2007,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1950,7 +2025,25 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1960,8 +2053,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -1988,7 +2081,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2030,9 +2123,27 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2043,7 +2154,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2056,7 +2167,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2103,8 +2214,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2120,9 +2231,27 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2132,9 +2261,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2147,7 +2276,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000130-flatten-set-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000130-flatten-set-pre-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000130-flatten-set-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000130-flatten-set-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000130-flatten-set-pre.yaml b/test/scenarios/attestation/output/clicommon-000130-flatten-set-pre.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000130-flatten-set-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000130-flatten-set-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000140-flatten-set-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000140-flatten-set-post-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000140-flatten-set-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000140-flatten-set-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000140-flatten-set-post.yaml b/test/scenarios/attestation/output/clicommon-000140-flatten-set-post.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000140-flatten-set-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000140-flatten-set-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000150-flatten-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000150-flatten-pre-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000150-flatten-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000150-flatten-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000150-flatten-pre.yaml b/test/scenarios/attestation/output/clicommon-000150-flatten-pre.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000150-flatten-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000150-flatten-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000160-flatten-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000160-flatten-post-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000160-flatten-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000160-flatten-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000160-flatten-post.yaml b/test/scenarios/attestation/output/clicommon-000160-flatten-post.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000160-flatten-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000160-flatten-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000170-poly-as-resource-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000170-poly-as-resource-pre.yaml b/test/scenarios/attestation/output/clicommon-000170-poly-as-resource-pre.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000170-poly-as-resource-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000170-poly-as-resource-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000180-poly-as-resource-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000180-poly-as-resource-post-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000180-poly-as-resource-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000180-poly-as-resource-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000180-poly-as-resource-post.yaml b/test/scenarios/attestation/output/clicommon-000180-poly-as-resource-post.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000180-poly-as-resource-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000180-poly-as-resource-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000190-flatten-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000190-flatten-pre-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000190-flatten-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000190-flatten-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000190-flatten-pre.yaml b/test/scenarios/attestation/output/clicommon-000190-flatten-pre.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000190-flatten-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000190-flatten-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000200-flatten-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000200-flatten-post-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000200-flatten-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000200-flatten-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000200-flatten-post.yaml b/test/scenarios/attestation/output/clicommon-000200-flatten-post.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000200-flatten-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000200-flatten-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000210-modifier-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000210-modifier-pre-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000210-modifier-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000210-modifier-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000210-modifier-pre.yaml b/test/scenarios/attestation/output/clicommon-000210-modifier-pre.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000210-modifier-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000210-modifier-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000220-modifier-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000220-modifier-post-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000220-modifier-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000220-modifier-post-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000220-modifier-post.yaml b/test/scenarios/attestation/output/clicommon-000220-modifier-post.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000220-modifier-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000220-modifier-post.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000230-namer-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000230-namer-pre-simplified.yaml
index 0dd2dd0..0cb4d87 100644
--- a/test/scenarios/attestation/output/clicommon-000230-namer-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000230-namer-pre-simplified.yaml
@@ -18,6 +18,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: attestation_providers
       cli:
         cliKey: AttestationProviders
@@ -48,6 +52,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create
           cli:
             cliKey: Create
@@ -78,6 +86,10 @@ operationGroups:
                 cliKey: creationParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: attestation_service_creation_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -108,6 +120,10 @@ operationGroups:
                 cliKey: updateParams
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: attestation_service_patch_params
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -133,6 +149,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list
           cli:
             cliKey: List
@@ -150,6 +170,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -171,6 +195,10 @@ operationGroups:
               cli:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000230-namer-pre.yaml b/test/scenarios/attestation/output/clicommon-000230-namer-pre.yaml
index 5078eb8..bcd024e 100644
--- a/test/scenarios/attestation/output/clicommon-000230-namer-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000230-namer-pre.yaml
@@ -85,7 +85,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -408,11 +408,20 @@ schemas:
           name: api_version2018_09_01_preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -424,7 +433,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_creation_params_tags
@@ -436,7 +444,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: attestation_service_patch_params_tags
@@ -446,7 +453,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -600,7 +607,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -903,7 +910,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1322,7 +1329,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1358,7 +1365,7 @@ schemas:
           cliKey: AttestationServicePatchParams
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1410,7 +1417,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1471,7 +1478,24 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1482,7 +1506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1495,7 +1519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1555,9 +1579,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1571,7 +1595,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1588,7 +1612,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1598,8 +1639,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -1614,7 +1655,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1661,9 +1702,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1677,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -1695,8 +1736,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -1710,8 +1751,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -1725,8 +1781,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -1753,7 +1809,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1815,9 +1871,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1831,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -1849,8 +1905,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -1864,8 +1920,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -1879,8 +1950,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -1895,7 +1966,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1947,9 +2018,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1963,7 +2034,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1980,7 +2051,24 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1990,8 +2078,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2018,7 +2106,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2059,9 +2147,26 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2072,7 +2177,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2085,7 +2190,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2131,8 +2236,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2147,9 +2252,26 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2159,9 +2281,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2174,7 +2296,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000240-namer-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000240-namer-post-simplified.yaml
index b0672fd..b506e81 100644
--- a/test/scenarios/attestation/output/clicommon-000240-namer-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000240-namer-post-simplified.yaml
@@ -22,6 +22,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: AttestationProviders
       cli:
         cliKey: AttestationProviders
@@ -60,6 +65,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Create
           cli:
             cliKey: Create
@@ -97,6 +107,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: AttestationServiceCreationParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -134,6 +149,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: AttestationServicePatchParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -165,6 +185,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: List
           cli:
             cliKey: List
@@ -186,6 +211,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -212,6 +242,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000240-namer-post.yaml b/test/scenarios/attestation/output/clicommon-000240-namer-post.yaml
index 1d1883f..f882d81 100644
--- a/test/scenarios/attestation/output/clicommon-000240-namer-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000240-namer-post.yaml
@@ -112,7 +112,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -554,11 +554,23 @@ schemas:
           name: ApiVersion20180901Preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -572,7 +584,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServiceCreationParamsTags
@@ -586,7 +597,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServicePatchParamsTags
@@ -598,7 +608,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -784,7 +794,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1141,7 +1151,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1692,7 +1702,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1734,7 +1744,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
           cliPath: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1794,7 +1804,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1864,7 +1874,27 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1875,7 +1905,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1888,7 +1918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1954,9 +1984,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1973,7 +2003,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1993,7 +2023,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2003,8 +2053,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -2019,7 +2069,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2069,9 +2119,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2088,7 +2138,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -2109,8 +2159,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -2127,8 +2177,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -2142,8 +2210,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -2170,7 +2238,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2235,9 +2303,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2254,7 +2322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -2275,8 +2343,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -2293,8 +2361,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -2308,8 +2394,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -2324,7 +2410,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2379,9 +2465,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2398,7 +2484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2418,7 +2504,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2428,8 +2534,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2456,7 +2562,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2500,9 +2606,29 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2513,7 +2639,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2526,7 +2652,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2575,8 +2701,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2594,9 +2720,29 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2606,9 +2752,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2621,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000250-test-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000250-test-pre-simplified.yaml
index 0d5fc8f..f4a348c 100644
--- a/test/scenarios/attestation/output/clicommon-000250-test-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000250-test-pre-simplified.yaml
@@ -22,6 +22,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: AttestationProviders
       cli:
         name: AttestationProvider
@@ -60,6 +65,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Create
           cli:
             cliKey: Create
@@ -97,6 +107,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: AttestationServiceCreationParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -134,6 +149,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: AttestationServicePatchParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -165,6 +185,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: List
           cli:
             cliKey: List
@@ -186,6 +211,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -212,6 +242,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000250-test-pre.yaml b/test/scenarios/attestation/output/clicommon-000250-test-pre.yaml
index 1d1883f..f882d81 100644
--- a/test/scenarios/attestation/output/clicommon-000250-test-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000250-test-pre.yaml
@@ -112,7 +112,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -554,11 +554,23 @@ schemas:
           name: ApiVersion20180901Preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -572,7 +584,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServiceCreationParamsTags
@@ -586,7 +597,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServicePatchParamsTags
@@ -598,7 +608,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -784,7 +794,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1141,7 +1151,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1692,7 +1702,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1734,7 +1744,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
           cliPath: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1794,7 +1804,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1864,7 +1874,27 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1875,7 +1905,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1888,7 +1918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1954,9 +1984,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1973,7 +2003,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1993,7 +2023,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2003,8 +2053,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -2019,7 +2069,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2069,9 +2119,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2088,7 +2138,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -2109,8 +2159,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -2127,8 +2177,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -2142,8 +2210,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -2170,7 +2238,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2235,9 +2303,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2254,7 +2322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -2275,8 +2343,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -2293,8 +2361,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -2308,8 +2394,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -2324,7 +2410,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2379,9 +2465,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2398,7 +2484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2418,7 +2504,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2428,8 +2534,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2456,7 +2562,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2500,9 +2606,29 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2513,7 +2639,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2526,7 +2652,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2575,8 +2701,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2594,9 +2720,29 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2606,9 +2752,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2621,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000260-test-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000260-test-post-simplified.yaml
index 0d5fc8f..f4a348c 100644
--- a/test/scenarios/attestation/output/clicommon-000260-test-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000260-test-post-simplified.yaml
@@ -22,6 +22,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: AttestationProviders
       cli:
         name: AttestationProvider
@@ -60,6 +65,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Create
           cli:
             cliKey: Create
@@ -97,6 +107,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: AttestationServiceCreationParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -134,6 +149,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: AttestationServicePatchParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -165,6 +185,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: List
           cli:
             cliKey: List
@@ -186,6 +211,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -212,6 +242,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000260-test-post.yaml b/test/scenarios/attestation/output/clicommon-000260-test-post.yaml
index 763fa18..1629bc4 100644
--- a/test/scenarios/attestation/output/clicommon-000260-test-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000260-test-post.yaml
@@ -112,7 +112,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -554,11 +554,23 @@ schemas:
           name: ApiVersion20180901Preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -572,7 +584,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServiceCreationParamsTags
@@ -586,7 +597,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServicePatchParamsTags
@@ -598,7 +608,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -784,7 +794,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1141,7 +1151,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1692,7 +1702,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1734,7 +1744,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
           cliPath: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1794,7 +1804,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1864,7 +1874,27 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1875,7 +1905,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1888,7 +1918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1954,9 +1984,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1973,7 +2003,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1993,7 +2023,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2003,8 +2053,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -2019,7 +2069,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2069,9 +2119,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2088,7 +2138,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -2109,8 +2159,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -2127,8 +2177,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -2142,8 +2210,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -2170,7 +2238,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2235,9 +2303,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2254,7 +2322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -2275,8 +2343,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -2293,8 +2361,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -2308,8 +2394,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -2324,7 +2410,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2379,9 +2465,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2398,7 +2484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2418,7 +2504,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2428,8 +2534,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2456,7 +2562,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2500,9 +2606,29 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2513,7 +2639,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2526,7 +2652,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2575,8 +2701,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2594,9 +2720,29 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2606,9 +2752,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2621,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000270-complex-marker-pre-simplified.yaml b/test/scenarios/attestation/output/clicommon-000270-complex-marker-pre-simplified.yaml
index 0d5fc8f..f4a348c 100644
--- a/test/scenarios/attestation/output/clicommon-000270-complex-marker-pre-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000270-complex-marker-pre-simplified.yaml
@@ -22,6 +22,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: AttestationProviders
       cli:
         name: AttestationProvider
@@ -60,6 +65,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Create
           cli:
             cliKey: Create
@@ -97,6 +107,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: AttestationServiceCreationParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -134,6 +149,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: AttestationServicePatchParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -165,6 +185,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: List
           cli:
             cliKey: List
@@ -186,6 +211,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -212,6 +242,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000270-complex-marker-pre.yaml b/test/scenarios/attestation/output/clicommon-000270-complex-marker-pre.yaml
index 763fa18..1629bc4 100644
--- a/test/scenarios/attestation/output/clicommon-000270-complex-marker-pre.yaml
+++ b/test/scenarios/attestation/output/clicommon-000270-complex-marker-pre.yaml
@@ -112,7 +112,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -554,11 +554,23 @@ schemas:
           name: ApiVersion20180901Preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -572,7 +584,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServiceCreationParamsTags
@@ -586,7 +597,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServicePatchParamsTags
@@ -598,7 +608,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -784,7 +794,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1141,7 +1151,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1692,7 +1702,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1734,7 +1744,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
           cliPath: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1794,7 +1804,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1864,7 +1874,27 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1875,7 +1905,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1888,7 +1918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1954,9 +1984,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1973,7 +2003,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1993,7 +2023,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2003,8 +2053,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -2019,7 +2069,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2069,9 +2119,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2088,7 +2138,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -2109,8 +2159,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -2127,8 +2177,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -2142,8 +2210,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -2170,7 +2238,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2235,9 +2303,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2254,7 +2322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -2275,8 +2343,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -2293,8 +2361,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -2308,8 +2394,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -2324,7 +2410,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2379,9 +2465,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2398,7 +2484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2418,7 +2504,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2428,8 +2534,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2456,7 +2562,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2500,9 +2606,29 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2513,7 +2639,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2526,7 +2652,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2575,8 +2701,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2594,9 +2720,29 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2606,9 +2752,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2621,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/attestation/output/clicommon-000280-complex-marker-post-simplified.yaml b/test/scenarios/attestation/output/clicommon-000280-complex-marker-post-simplified.yaml
index a46cad2..ebcdf34 100644
--- a/test/scenarios/attestation/output/clicommon-000280-complex-marker-post-simplified.yaml
+++ b/test/scenarios/attestation/output/clicommon-000280-complex-marker-post-simplified.yaml
@@ -22,6 +22,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operation']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: AttestationProviders
       cli:
         name: AttestationProvider
@@ -60,6 +65,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Create
           cli:
             cliKey: Create
@@ -97,6 +107,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['creationParams']
               bodySchema: AttestationServiceCreationParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Create']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -134,6 +149,11 @@ operationGroups:
                 cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
                 cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['updateParams']
               bodySchema: AttestationServicePatchParams
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -165,6 +185,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: List
           cli:
             cliKey: List
@@ -186,6 +211,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -212,6 +242,11 @@ operationGroups:
                 cliKey: subscriptionId
                 cliM4Path: globalParameters['subscriptionId']
                 cliPath: globalParameters['subscriptionId']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['AttestationProviders']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/attestation/output/clicommon-000280-complex-marker-post.yaml b/test/scenarios/attestation/output/clicommon-000280-complex-marker-post.yaml
index 763fa18..1629bc4 100644
--- a/test/scenarios/attestation/output/clicommon-000280-complex-marker-post.yaml
+++ b/test/scenarios/attestation/output/clicommon-000280-complex-marker-post.yaml
@@ -112,7 +112,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_59
+    - &ref_60
       type: string
       apiVersions:
         - version: 2018-09-01-preview
@@ -554,11 +554,23 @@ schemas:
           name: ApiVersion20180901Preview
           description: Api Version (2018-09-01-preview)
       protocol: {}
+    - &ref_56
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_18
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -572,7 +584,6 @@ schemas:
     - &ref_25
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServiceCreationParamsTags
@@ -586,7 +597,6 @@ schemas:
     - &ref_47
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: AttestationServicePatchParamsTags
@@ -598,7 +608,7 @@ schemas:
           cli-mark: checked
       protocol: {}
   objects:
-    - &ref_56
+    - &ref_57
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -784,7 +794,7 @@ schemas:
       protocol: {}
     - *ref_7
     - *ref_8
-    - &ref_57
+    - &ref_58
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1141,7 +1151,7 @@ schemas:
     - *ref_23
     - *ref_13
     - *ref_17
-    - &ref_62
+    - &ref_63
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1692,7 +1702,7 @@ schemas:
     - *ref_44
     - *ref_45
     - *ref_46
-    - &ref_66
+    - &ref_67
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1734,7 +1744,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AttestationServicePatchParams'']'
           cliPath: 'schemas$$objects[''AttestationServicePatchParams'']'
       protocol: {}
-    - &ref_72
+    - &ref_73
       type: object
       apiVersions:
         - version: 2018-09-01-preview
@@ -1794,7 +1804,7 @@ schemas:
     - *ref_50
     - *ref_51
 globalParameters:
-  - &ref_58
+  - &ref_59
     schema: *ref_52
     implementation: Client
     required: true
@@ -1864,7 +1874,27 @@ operationGroups:
           - *ref_54
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operation'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1875,7 +1905,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_56
+          - schema: *ref_57
             language:
               default:
                 name: ''
@@ -1888,7 +1918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -1954,9 +1984,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_60
-            schema: *ref_59
+          - *ref_59
+          - &ref_61
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -1973,7 +2003,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_61
+          - &ref_62
             schema: *ref_1
             implementation: Method
             required: true
@@ -1993,7 +2023,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2003,8 +2053,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_60
           - *ref_61
+          - *ref_62
         responses:
           - schema: *ref_12
             language:
@@ -2019,7 +2069,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2069,9 +2119,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_64
-            schema: *ref_59
+          - *ref_59
+          - &ref_65
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2088,7 +2138,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_65
+          - &ref_66
             schema: *ref_1
             implementation: Method
             required: true
@@ -2109,8 +2159,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_63
-                schema: *ref_62
+              - &ref_64
+                schema: *ref_63
                 implementation: Method
                 required: true
                 language:
@@ -2127,8 +2177,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Create'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_63
+              - *ref_64
             language:
               default:
                 name: ''
@@ -2142,8 +2210,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_64
           - *ref_65
+          - *ref_66
         responses:
           - schema: *ref_12
             language:
@@ -2170,7 +2238,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2235,9 +2303,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_68
-            schema: *ref_59
+          - *ref_59
+          - &ref_69
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2254,7 +2322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_69
+          - &ref_70
             schema: *ref_1
             implementation: Method
             required: true
@@ -2275,8 +2343,8 @@ operationGroups:
           - *ref_55
         requests:
           - parameters:
-              - &ref_67
-                schema: *ref_66
+              - &ref_68
+                schema: *ref_67
                 implementation: Method
                 required: true
                 language:
@@ -2293,8 +2361,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_67
+              - *ref_68
             language:
               default:
                 name: ''
@@ -2308,8 +2394,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_68
           - *ref_69
+          - *ref_70
         responses:
           - schema: *ref_12
             language:
@@ -2324,7 +2410,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2379,9 +2465,9 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - *ref_58
-          - &ref_70
-            schema: *ref_59
+          - *ref_59
+          - &ref_71
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2398,7 +2484,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2418,7 +2504,27 @@ operationGroups:
                 in: path
           - *ref_55
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2428,8 +2534,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - language:
               default:
@@ -2456,7 +2562,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2500,9 +2606,29 @@ operationGroups:
         parameters:
           - *ref_54
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2513,7 +2639,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2526,7 +2652,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
@@ -2575,8 +2701,8 @@ operationGroups:
           - version: 2018-09-01-preview
         parameters:
           - *ref_54
-          - &ref_73
-            schema: *ref_59
+          - &ref_74
+            schema: *ref_60
             implementation: Method
             required: true
             language:
@@ -2594,9 +2720,29 @@ operationGroups:
               http:
                 in: path
           - *ref_55
-          - *ref_58
+          - *ref_59
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_56
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''AttestationProviders'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2606,9 +2752,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_73
+          - *ref_74
         responses:
-          - schema: *ref_72
+          - schema: *ref_73
             language:
               default:
                 name: ''
@@ -2621,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_57
+          - schema: *ref_58
             language:
               default:
                 name: ''
diff --git a/test/scenarios/datafactory/output/clicommon-000010-prename-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000010-prename-pre-simplified.yaml
index fc632f4..14d9722 100644
--- a/test/scenarios/datafactory/output/clicommon-000010-prename-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000010-prename-pre-simplified.yaml
@@ -7,6 +7,7 @@ operationGroups:
             - parameterName: $host(string^string)
             - parameterName: subscriptionId(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: ConfigureFactoryRepo
           parameters:
             - parameterName: $host(string^string)
@@ -15,12 +16,14 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: factoryRepoUpdate(FactoryRepoUpdate^object)
               bodySchema: FactoryRepoUpdate
+            - parameterName[0]: accept(Accept^constant)
         - operationName: ListByResourceGroup
           parameters:
             - parameterName: $host(string^string)
             - parameterName: subscriptionId(string^string)
             - parameterName: resourceGroupName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: CreateOrUpdate
           parameters:
             - parameterName: $host(string^string)
@@ -31,6 +34,7 @@ operationGroups:
             - parameterName: If-Match(string^string)
             - parameterName[0]: factory(Factory^object)
               bodySchema: Factory
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Update
           parameters:
             - parameterName: $host(string^string)
@@ -40,6 +44,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: factoryUpdateParameters(FactoryUpdateParameters^object)
               bodySchema: FactoryUpdateParameters
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Get
           parameters:
             - parameterName: $host(string^string)
@@ -48,6 +53,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName: If-None-Match(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Delete
           parameters:
             - parameterName: $host(string^string)
@@ -55,6 +61,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: factoryName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: GetGitHubAccessToken
           parameters:
             - parameterName: $host(string^string)
@@ -64,6 +71,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: gitHubAccessTokenRequest(GitHubAccessTokenRequest^object)
               bodySchema: GitHubAccessTokenRequest
+            - parameterName[0]: accept(Accept^constant)
         - operationName: GetDataPlaneAccess
           parameters:
             - parameterName: $host(string^string)
@@ -73,6 +81,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: policy(UserAccessPolicy^object)
               bodySchema: UserAccessPolicy
+            - parameterName[0]: accept(Accept^constant)
     - operationGroupName: Triggers
       operations:
         - operationName: ListByFactory
@@ -82,6 +91,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: factoryName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: QueryByFactory
           parameters:
             - parameterName: $host(string^string)
@@ -91,6 +101,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: filterParameters(TriggerFilterParameters^object)
               bodySchema: TriggerFilterParameters
+            - parameterName[0]: accept(Accept^constant)
         - operationName: CreateOrUpdate
           parameters:
             - parameterName: $host(string^string)
@@ -102,6 +113,7 @@ operationGroups:
             - parameterName: If-Match(string^string)
             - parameterName[0]: trigger(TriggerResource^object)
               bodySchema: TriggerResource
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Get
           parameters:
             - parameterName: $host(string^string)
@@ -111,6 +123,7 @@ operationGroups:
             - parameterName: triggerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName: If-None-Match(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Delete
           parameters:
             - parameterName: $host(string^string)
@@ -119,6 +132,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: triggerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: SubscribeToEvents
           parameters:
             - parameterName: $host(string^string)
@@ -127,6 +141,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: triggerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: GetEventSubscriptionStatus
           parameters:
             - parameterName: $host(string^string)
@@ -135,6 +150,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: triggerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: UnsubscribeFromEvents
           parameters:
             - parameterName: $host(string^string)
@@ -143,6 +159,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: triggerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Start
           parameters:
             - parameterName: $host(string^string)
@@ -151,6 +168,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: triggerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Stop
           parameters:
             - parameterName: $host(string^string)
@@ -159,6 +177,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: triggerName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
     - operationGroupName: IntegrationRuntimes
       operations:
         - operationName: ListByFactory
@@ -168,6 +187,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: factoryName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: CreateOrUpdate
           parameters:
             - parameterName: $host(string^string)
@@ -179,6 +199,7 @@ operationGroups:
             - parameterName: If-Match(string^string)
             - parameterName[0]: integrationRuntime(IntegrationRuntimeResource^object)
               bodySchema: IntegrationRuntimeResource
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Get
           parameters:
             - parameterName: $host(string^string)
@@ -188,6 +209,7 @@ operationGroups:
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName: If-None-Match(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Update
           parameters:
             - parameterName: $host(string^string)
@@ -198,6 +220,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: updateIntegrationRuntimeRequest(UpdateIntegrationRuntimeRequest^object)
               bodySchema: UpdateIntegrationRuntimeRequest
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Delete
           parameters:
             - parameterName: $host(string^string)
@@ -206,6 +229,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: GetStatus
           parameters:
             - parameterName: $host(string^string)
@@ -214,6 +238,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: GetConnectionInfo
           parameters:
             - parameterName: $host(string^string)
@@ -222,6 +247,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: RegenerateAuthKey
           parameters:
             - parameterName: $host(string^string)
@@ -232,6 +258,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: regenerateKeyParameters(IntegrationRuntimeRegenerateKeyParameters^object)
               bodySchema: IntegrationRuntimeRegenerateKeyParameters
+            - parameterName[0]: accept(Accept^constant)
         - operationName: ListAuthKeys
           parameters:
             - parameterName: $host(string^string)
@@ -240,6 +267,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Start
           parameters:
             - parameterName: $host(string^string)
@@ -248,6 +276,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Stop
           parameters:
             - parameterName: $host(string^string)
@@ -256,6 +285,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: SyncCredentials
           parameters:
             - parameterName: $host(string^string)
@@ -264,6 +294,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: GetMonitoringData
           parameters:
             - parameterName: $host(string^string)
@@ -272,6 +303,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Upgrade
           parameters:
             - parameterName: $host(string^string)
@@ -280,6 +312,7 @@ operationGroups:
             - parameterName: factoryName(string^string)
             - parameterName: integrationRuntimeName(string^string)
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: RemoveLinks
           parameters:
             - parameterName: $host(string^string)
@@ -290,6 +323,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: linkedIntegrationRuntimeRequest(LinkedIntegrationRuntimeRequest^object)
               bodySchema: LinkedIntegrationRuntimeRequest
+            - parameterName[0]: accept(Accept^constant)
         - operationName: CreateLinkedIntegrationRuntime
           parameters:
             - parameterName: $host(string^string)
@@ -300,6 +334,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
             - parameterName[0]: createLinkedIntegrationRuntimeRequest(CreateLinkedIntegrationRuntimeRequest^object)
               bodySchema: CreateLinkedIntegrationRuntimeRequest
+            - parameterName[0]: accept(Accept^constant)
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000010-prename-pre.yaml b/test/scenarios/datafactory/output/clicommon-000010-prename-pre.yaml
index 288989f..3cad7dc 100644
--- a/test/scenarios/datafactory/output/clicommon-000010-prename-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000010-prename-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: FactoryRepoUpdate-factoryResourceId
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: TriggerQueryResponse-continuationToken
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2368,6 +2368,16 @@ schemas:
           name: ApiVersion-2018-06-01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2434,7 +2444,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: Resource-tags
@@ -2443,7 +2452,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: FactoryUpdateParameters-tags
@@ -2596,7 +2604,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeNode-capabilities
@@ -2605,7 +2612,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeStatusTypeProperties-capabilities
@@ -2844,7 +2850,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3380,7 +3386,7 @@ schemas:
           namespace: ''
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3409,7 +3415,7 @@ schemas:
           description: Factory's git repo information.
           namespace: ''
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3438,7 +3444,7 @@ schemas:
           description: Parameters for updating a factory resource.
           namespace: ''
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3477,7 +3483,7 @@ schemas:
           description: Get GitHub access token request definition.
           namespace: ''
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3550,7 +3556,7 @@ schemas:
           description: Get Data Plane read only token request definition.
           namespace: ''
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3586,7 +3592,7 @@ schemas:
           description: Get Data Plane read only token response definition.
           namespace: ''
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5963,7 +5969,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5992,7 +5998,7 @@ schemas:
           description: Query parameters for triggers.
           namespace: ''
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6032,7 +6038,7 @@ schemas:
           description: A query of triggers.
           namespace: ''
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6063,7 +6069,7 @@ schemas:
           description: Defines the response of a trigger subscription operation.
           namespace: ''
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6105,7 +6111,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6931,7 +6937,7 @@ schemas:
           namespace: ''
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6999,7 +7005,7 @@ schemas:
           description: Connection information for encrypting the on-premises data source credentials.
           namespace: ''
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7021,7 +7027,7 @@ schemas:
           description: Parameters to regenerate the authentication key.
           namespace: ''
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7050,7 +7056,7 @@ schemas:
           description: The integration runtime authentication keys.
           namespace: ''
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7172,7 +7178,7 @@ schemas:
           namespace: ''
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7195,7 +7201,7 @@ schemas:
           description: Data factory name for linked integration runtime request.
           namespace: ''
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7952,7 +7958,21 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -7963,7 +7983,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -8162,7 +8182,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -8177,8 +8197,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -8189,8 +8209,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -8204,7 +8236,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -8288,8 +8320,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -8302,7 +8334,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -8312,9 +8358,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -8414,8 +8460,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -8426,8 +8472,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -8439,7 +8485,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -8452,7 +8498,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -8464,8 +8510,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -8479,9 +8537,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -8547,8 +8605,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -8559,8 +8617,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -8574,8 +8632,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -8586,8 +8644,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -8601,8 +8671,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -8670,8 +8740,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -8682,8 +8752,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -8695,7 +8765,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -8707,7 +8777,21 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -8717,9 +8801,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -8803,8 +8887,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -8815,8 +8899,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -8829,7 +8913,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -8839,8 +8937,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -8892,8 +8990,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -8904,8 +9002,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -8919,8 +9017,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -8931,8 +9029,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -8946,10 +9056,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -9006,8 +9116,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9018,8 +9128,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9033,7 +9143,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -9045,8 +9155,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -9060,10 +9182,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -9136,8 +9258,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9148,8 +9270,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9162,7 +9284,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9172,10 +9308,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -9254,8 +9390,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9266,8 +9402,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9281,8 +9417,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -9293,8 +9429,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -9308,10 +9456,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -9378,8 +9526,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9390,8 +9538,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9402,8 +9550,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -9415,7 +9563,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -9428,7 +9576,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -9440,8 +9588,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -9455,10 +9615,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -9609,8 +9769,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9621,8 +9781,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9633,8 +9793,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -9646,7 +9806,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -9658,7 +9818,21 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9668,10 +9842,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -9757,8 +9931,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9769,8 +9943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9781,8 +9955,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -9795,7 +9969,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9805,9 +9993,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -9860,8 +10048,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9872,8 +10060,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9884,8 +10072,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -9898,7 +10086,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9908,11 +10110,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -9974,8 +10176,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9986,8 +10188,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9998,8 +10200,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10012,7 +10214,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10022,11 +10238,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -10075,8 +10291,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10087,8 +10303,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10099,8 +10315,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10113,7 +10329,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10123,11 +10353,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -10189,8 +10419,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10201,8 +10431,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10213,8 +10443,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10227,7 +10457,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10237,9 +10481,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -10284,8 +10528,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10296,8 +10540,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10308,8 +10552,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10322,7 +10566,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10332,9 +10590,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -10386,8 +10644,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10398,8 +10656,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10412,7 +10670,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,10 +10694,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -10490,8 +10762,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10502,8 +10774,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10514,8 +10786,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10527,7 +10799,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -10540,7 +10812,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -10552,8 +10824,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -10567,10 +10851,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -10637,8 +10921,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10649,8 +10933,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10661,8 +10945,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10674,7 +10958,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -10686,7 +10970,21 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10696,10 +10994,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -10771,8 +11069,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10783,8 +11081,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10795,8 +11093,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10810,8 +11108,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -10822,8 +11120,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -10837,9 +11147,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -10904,8 +11214,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10916,8 +11226,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10928,8 +11238,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10942,7 +11252,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10952,9 +11276,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -11007,8 +11331,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11019,8 +11343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11031,8 +11355,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11045,7 +11369,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11055,9 +11393,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -11153,8 +11491,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11165,8 +11503,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11177,8 +11515,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11191,7 +11529,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11201,11 +11553,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -11264,8 +11616,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11276,8 +11628,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11288,8 +11640,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11303,8 +11655,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -11315,8 +11667,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -11330,11 +11694,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -11390,8 +11754,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11402,8 +11766,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11414,8 +11778,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11428,7 +11792,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11438,11 +11816,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -11497,8 +11875,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11509,8 +11887,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11521,8 +11899,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11535,7 +11913,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11545,9 +11937,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -11621,8 +12013,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11633,8 +12025,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11645,8 +12037,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11659,7 +12051,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11669,9 +12075,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -11725,8 +12131,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11737,8 +12143,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11749,8 +12155,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11763,7 +12169,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11773,9 +12193,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -11821,8 +12241,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11833,8 +12253,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11845,8 +12265,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11859,7 +12279,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11869,11 +12303,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -11935,8 +12369,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11947,8 +12381,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11959,8 +12393,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11973,7 +12407,21 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11983,9 +12431,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -12029,8 +12477,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12041,8 +12489,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12053,8 +12501,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12068,8 +12516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -12080,8 +12528,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -12095,9 +12555,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -12143,8 +12603,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12155,8 +12615,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12167,8 +12627,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12182,8 +12642,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -12194,8 +12654,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -12209,9 +12681,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000020-prename-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000020-prename-post-simplified.yaml
index 4165a83..8408f5a 100644
--- a/test/scenarios/datafactory/output/clicommon-000020-prename-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000020-prename-post-simplified.yaml
@@ -17,6 +17,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: ConfigureFactoryRepo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -37,6 +40,9 @@ operationGroups:
               cli:
                 cliKey: factoryRepoUpdate
               bodySchema: FactoryRepoUpdate
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -53,6 +59,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -79,6 +88,9 @@ operationGroups:
               cli:
                 cliKey: factory
               bodySchema: Factory
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Update
           cli:
             cliKey: Update
@@ -102,6 +114,9 @@ operationGroups:
               cli:
                 cliKey: factoryUpdateParameters
               bodySchema: FactoryUpdateParameters
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Get
           cli:
             cliKey: Get
@@ -124,6 +139,9 @@ operationGroups:
             - parameterName: If-None-Match(string^string)
               cli:
                 cliKey: If-None-Match
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -143,6 +161,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: GetGitHubAccessToken
           cli:
             cliKey: GetGitHubAccessToken
@@ -166,6 +187,9 @@ operationGroups:
               cli:
                 cliKey: gitHubAccessTokenRequest
               bodySchema: GitHubAccessTokenRequest
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: GetDataPlaneAccess
           cli:
             cliKey: GetDataPlaneAccess
@@ -189,6 +213,9 @@ operationGroups:
               cli:
                 cliKey: policy
               bodySchema: UserAccessPolicy
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: Triggers
       cli:
         cliKey: Triggers
@@ -212,6 +239,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: QueryByFactory
           cli:
             cliKey: QueryByFactory
@@ -235,6 +265,9 @@ operationGroups:
               cli:
                 cliKey: filterParameters
               bodySchema: TriggerFilterParameters
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -264,6 +297,9 @@ operationGroups:
               cli:
                 cliKey: trigger
               bodySchema: TriggerResource
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Get
           cli:
             cliKey: Get
@@ -289,6 +325,9 @@ operationGroups:
             - parameterName: If-None-Match(string^string)
               cli:
                 cliKey: If-None-Match
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -311,6 +350,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: SubscribeToEvents
           cli:
             cliKey: SubscribeToEvents
@@ -333,6 +375,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: GetEventSubscriptionStatus
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -355,6 +400,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: UnsubscribeFromEvents
           cli:
             cliKey: UnsubscribeFromEvents
@@ -377,6 +425,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Start
           cli:
             cliKey: Start
@@ -399,6 +450,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -421,6 +475,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: IntegrationRuntimes
       cli:
         cliKey: IntegrationRuntimes
@@ -444,6 +501,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -473,6 +533,9 @@ operationGroups:
               cli:
                 cliKey: integrationRuntime
               bodySchema: IntegrationRuntimeResource
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Get
           cli:
             cliKey: Get
@@ -498,6 +561,9 @@ operationGroups:
             - parameterName: If-None-Match(string^string)
               cli:
                 cliKey: If-None-Match
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Update
           cli:
             cliKey: Update
@@ -524,6 +590,9 @@ operationGroups:
               cli:
                 cliKey: updateIntegrationRuntimeRequest
               bodySchema: UpdateIntegrationRuntimeRequest
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -546,6 +615,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: GetStatus
           cli:
             cliKey: GetStatus
@@ -568,6 +640,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: GetConnectionInfo
           cli:
             cliKey: GetConnectionInfo
@@ -590,6 +665,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: RegenerateAuthKey
           cli:
             cliKey: RegenerateAuthKey
@@ -616,6 +694,9 @@ operationGroups:
               cli:
                 cliKey: regenerateKeyParameters
               bodySchema: IntegrationRuntimeRegenerateKeyParameters
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: ListAuthKeys
           cli:
             cliKey: ListAuthKeys
@@ -638,6 +719,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Start
           cli:
             cliKey: Start
@@ -660,6 +744,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -682,6 +769,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: SyncCredentials
           cli:
             cliKey: SyncCredentials
@@ -704,6 +794,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: GetMonitoringData
           cli:
             cliKey: GetMonitoringData
@@ -726,6 +819,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Upgrade
           cli:
             cliKey: Upgrade
@@ -748,6 +844,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2018-06-01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: RemoveLinks
           cli:
             cliKey: RemoveLinks
@@ -774,6 +873,9 @@ operationGroups:
               cli:
                 cliKey: linkedIntegrationRuntimeRequest
               bodySchema: LinkedIntegrationRuntimeRequest
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: CreateLinkedIntegrationRuntime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -800,6 +902,9 @@ operationGroups:
               cli:
                 cliKey: createLinkedIntegrationRuntimeRequest
               bodySchema: CreateLinkedIntegrationRuntimeRequest
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000020-prename-post.yaml b/test/scenarios/datafactory/output/clicommon-000020-prename-post.yaml
index 84550b7..993e9d2 100644
--- a/test/scenarios/datafactory/output/clicommon-000020-prename-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000020-prename-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: FactoryRepoUpdate-factoryResourceId
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: TriggerQueryResponse-continuationToken
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2580,6 +2580,16 @@ schemas:
           name: ApiVersion-2018-06-01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2646,7 +2656,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: Resource-tags
@@ -2655,7 +2664,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: FactoryUpdateParameters-tags
@@ -2808,7 +2816,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeNode-capabilities
@@ -2817,7 +2824,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeStatusTypeProperties-capabilities
@@ -3056,7 +3062,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3684,7 +3690,7 @@ schemas:
           cliKey: CloudError
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3719,7 +3725,7 @@ schemas:
         cli:
           cliKey: FactoryRepoUpdate
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3754,7 +3760,7 @@ schemas:
         cli:
           cliKey: FactoryUpdateParameters
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3801,7 +3807,7 @@ schemas:
         cli:
           cliKey: GitHubAccessTokenRequest
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3890,7 +3896,7 @@ schemas:
         cli:
           cliKey: UserAccessPolicy
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3934,7 +3940,7 @@ schemas:
         cli:
           cliKey: AccessPolicyResponse
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6691,7 +6697,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6726,7 +6732,7 @@ schemas:
         cli:
           cliKey: TriggerFilterParameters
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6772,7 +6778,7 @@ schemas:
         cli:
           cliKey: TriggerQueryResponse
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6809,7 +6815,7 @@ schemas:
         cli:
           cliKey: TriggerSubscriptionOperationStatus
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6857,7 +6863,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7837,7 +7843,7 @@ schemas:
           cliKey: IntegrationRuntimeStatusResponse
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7919,7 +7925,7 @@ schemas:
         cli:
           cliKey: IntegrationRuntimeConnectionInfo
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7945,7 +7951,7 @@ schemas:
         cli:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7980,7 +7986,7 @@ schemas:
         cli:
           cliKey: IntegrationRuntimeAuthKeys
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8126,7 +8132,7 @@ schemas:
           cliKey: IntegrationRuntimeMonitoringData
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8153,7 +8159,7 @@ schemas:
         cli:
           cliKey: LinkedIntegrationRuntimeRequest
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9040,7 +9046,23 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9051,7 +9073,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9252,7 +9274,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9269,8 +9291,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9283,8 +9305,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9298,7 +9334,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9384,8 +9420,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9400,7 +9436,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9410,9 +9462,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9514,8 +9566,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9528,8 +9580,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9543,7 +9595,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -9558,7 +9610,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -9572,8 +9624,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -9587,9 +9653,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -9657,8 +9723,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9671,8 +9737,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9688,8 +9754,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -9702,8 +9768,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -9717,8 +9797,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -9788,8 +9868,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9802,8 +9882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9817,7 +9897,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -9831,7 +9911,23 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9841,9 +9937,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -9929,8 +10025,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9943,8 +10039,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9959,7 +10055,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9969,8 +10081,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10024,8 +10136,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10038,8 +10150,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10055,8 +10167,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10069,8 +10181,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10084,10 +10210,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10146,8 +10272,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10160,8 +10286,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10177,7 +10303,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10191,8 +10317,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10206,10 +10346,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10286,8 +10426,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10300,8 +10440,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10316,7 +10456,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10326,10 +10482,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10410,8 +10566,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10424,8 +10580,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10441,8 +10597,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -10455,8 +10611,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -10470,10 +10640,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -10542,8 +10712,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10556,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10570,8 +10740,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10585,7 +10755,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -10600,7 +10770,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -10614,8 +10784,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -10629,10 +10813,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -10785,8 +10969,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10799,8 +10983,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10813,8 +10997,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10828,7 +11012,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -10842,7 +11026,23 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10852,10 +11052,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -10943,8 +11143,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10957,8 +11157,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10971,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10987,7 +11187,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10997,9 +11213,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11054,8 +11270,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11068,8 +11284,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11082,8 +11298,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11098,7 +11314,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11108,11 +11340,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11176,8 +11408,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11190,8 +11422,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11204,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11220,7 +11452,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,11 +11478,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11285,8 +11533,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11299,8 +11547,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11313,8 +11561,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11329,7 +11577,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11339,11 +11603,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11407,8 +11671,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11421,8 +11685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11435,8 +11699,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11451,7 +11715,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11461,9 +11741,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -11510,8 +11790,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11524,8 +11804,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11538,8 +11818,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11554,7 +11834,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11564,9 +11860,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -11622,8 +11918,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11636,8 +11932,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11652,7 +11948,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11662,10 +11974,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -11732,8 +12044,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11746,8 +12058,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11760,8 +12072,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11775,7 +12087,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -11790,7 +12102,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -11804,8 +12116,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -11819,10 +12145,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -11891,8 +12217,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11905,8 +12231,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11919,8 +12245,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11934,7 +12260,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -11948,7 +12274,23 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11958,10 +12300,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12035,8 +12377,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12049,8 +12391,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12063,8 +12405,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12080,8 +12422,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12094,8 +12436,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12109,9 +12465,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12178,8 +12534,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12192,8 +12548,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12206,8 +12562,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12222,7 +12578,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12232,9 +12604,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12289,8 +12661,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12303,8 +12675,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12317,8 +12689,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12333,7 +12705,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12343,9 +12731,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -12443,8 +12831,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12457,8 +12845,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12471,8 +12859,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12487,7 +12875,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12497,11 +12901,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -12562,8 +12966,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12576,8 +12980,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12590,8 +12994,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12607,8 +13011,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -12621,8 +13025,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -12636,11 +13054,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -12698,8 +13116,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12712,8 +13130,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12726,8 +13144,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12742,7 +13160,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12752,11 +13186,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -12813,8 +13247,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12827,8 +13261,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12841,8 +13275,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12857,7 +13291,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12867,9 +13317,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -12945,8 +13395,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12959,8 +13409,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12973,8 +13423,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12989,7 +13439,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12999,9 +13465,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13057,8 +13523,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13071,8 +13537,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13085,8 +13551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13101,7 +13567,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13111,9 +13593,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13161,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13175,8 +13657,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13189,8 +13671,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13205,7 +13687,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13215,11 +13713,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13283,8 +13781,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13297,8 +13795,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13311,8 +13809,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13327,7 +13825,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13337,9 +13851,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -13385,8 +13899,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13399,8 +13913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13413,8 +13927,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13430,8 +13944,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -13444,8 +13958,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -13459,9 +13987,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -13509,8 +14037,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13523,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13537,8 +14065,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13554,8 +14082,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -13568,8 +14096,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -13583,9 +14125,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
index cc05de2..aff18c9 100644
--- a/test/scenarios/datafactory/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
@@ -17,6 +17,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -37,6 +40,9 @@ operationGroups:
               cli:
                 cliKey: factoryRepoUpdate
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -53,6 +59,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -79,6 +88,9 @@ operationGroups:
               cli:
                 cliKey: factory
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: update
           cli:
             cliKey: Update
@@ -102,6 +114,9 @@ operationGroups:
               cli:
                 cliKey: factoryUpdateParameters
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get
           cli:
             cliKey: Get
@@ -124,6 +139,9 @@ operationGroups:
             - parameterName: if_none_match(string^string)
               cli:
                 cliKey: If-None-Match
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: delete
           cli:
             cliKey: Delete
@@ -143,6 +161,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -166,6 +187,9 @@ operationGroups:
               cli:
                 cliKey: gitHubAccessTokenRequest
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -189,6 +213,9 @@ operationGroups:
               cli:
                 cliKey: policy
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -212,6 +239,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -235,6 +265,9 @@ operationGroups:
               cli:
                 cliKey: filterParameters
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -264,6 +297,9 @@ operationGroups:
               cli:
                 cliKey: trigger
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get
           cli:
             cliKey: Get
@@ -289,6 +325,9 @@ operationGroups:
             - parameterName: if_none_match(string^string)
               cli:
                 cliKey: If-None-Match
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: delete
           cli:
             cliKey: Delete
@@ -311,6 +350,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -333,6 +375,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -355,6 +400,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -377,6 +425,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: start
           cli:
             cliKey: Start
@@ -399,6 +450,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: stop
           cli:
             cliKey: Stop
@@ -421,6 +475,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -444,6 +501,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -473,6 +533,9 @@ operationGroups:
               cli:
                 cliKey: integrationRuntime
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get
           cli:
             cliKey: Get
@@ -498,6 +561,9 @@ operationGroups:
             - parameterName: if_none_match(string^string)
               cli:
                 cliKey: If-None-Match
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: update
           cli:
             cliKey: Update
@@ -524,6 +590,9 @@ operationGroups:
               cli:
                 cliKey: updateIntegrationRuntimeRequest
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: delete
           cli:
             cliKey: Delete
@@ -546,6 +615,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -568,6 +640,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -590,6 +665,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -616,6 +694,9 @@ operationGroups:
               cli:
                 cliKey: regenerateKeyParameters
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -638,6 +719,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: start
           cli:
             cliKey: Start
@@ -660,6 +744,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: stop
           cli:
             cliKey: Stop
@@ -682,6 +769,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -704,6 +794,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -726,6 +819,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -748,6 +844,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2018_06_01^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -774,6 +873,9 @@ operationGroups:
               cli:
                 cliKey: linkedIntegrationRuntimeRequest
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -800,6 +902,9 @@ operationGroups:
               cli:
                 cliKey: createLinkedIntegrationRuntimeRequest
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000030-modeler-post-processor-pre.yaml b/test/scenarios/datafactory/output/clicommon-000030-modeler-post-processor-pre.yaml
index ba02a78..00a8deb 100644
--- a/test/scenarios/datafactory/output/clicommon-000030-modeler-post-processor-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000030-modeler-post-processor-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2580,6 +2580,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2646,7 +2656,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2655,7 +2664,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2808,7 +2816,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2817,7 +2824,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3056,7 +3062,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3684,7 +3690,7 @@ schemas:
           cliKey: CloudError
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3719,7 +3725,7 @@ schemas:
         cli:
           cliKey: FactoryRepoUpdate
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3754,7 +3760,7 @@ schemas:
         cli:
           cliKey: FactoryUpdateParameters
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3801,7 +3807,7 @@ schemas:
         cli:
           cliKey: GitHubAccessTokenRequest
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3890,7 +3896,7 @@ schemas:
         cli:
           cliKey: UserAccessPolicy
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3934,7 +3940,7 @@ schemas:
         cli:
           cliKey: AccessPolicyResponse
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6691,7 +6697,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6726,7 +6732,7 @@ schemas:
         cli:
           cliKey: TriggerFilterParameters
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6772,7 +6778,7 @@ schemas:
         cli:
           cliKey: TriggerQueryResponse
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6809,7 +6815,7 @@ schemas:
         cli:
           cliKey: TriggerSubscriptionOperationStatus
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -6857,7 +6863,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7837,7 +7843,7 @@ schemas:
           cliKey: IntegrationRuntimeStatusResponse
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7919,7 +7925,7 @@ schemas:
         cli:
           cliKey: IntegrationRuntimeConnectionInfo
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7945,7 +7951,7 @@ schemas:
         cli:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7980,7 +7986,7 @@ schemas:
         cli:
           cliKey: IntegrationRuntimeAuthKeys
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8126,7 +8132,7 @@ schemas:
           cliKey: IntegrationRuntimeMonitoringData
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8153,7 +8159,7 @@ schemas:
         cli:
           cliKey: LinkedIntegrationRuntimeRequest
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9040,7 +9046,23 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9051,7 +9073,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9252,7 +9274,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9269,8 +9291,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9283,8 +9305,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9298,7 +9334,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9384,8 +9420,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9400,7 +9436,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9410,9 +9462,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9514,8 +9566,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9528,8 +9580,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9543,7 +9595,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -9558,7 +9610,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -9572,8 +9624,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -9587,9 +9653,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -9657,8 +9723,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9671,8 +9737,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9688,8 +9754,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -9702,8 +9768,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -9717,8 +9797,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -9788,8 +9868,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9802,8 +9882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9817,7 +9897,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -9831,7 +9911,23 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9841,9 +9937,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -9929,8 +10025,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9943,8 +10039,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -9959,7 +10055,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9969,8 +10081,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10024,8 +10136,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10038,8 +10150,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10055,8 +10167,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10069,8 +10181,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10084,10 +10210,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10146,8 +10272,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10160,8 +10286,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10177,7 +10303,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10191,8 +10317,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10206,10 +10346,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10286,8 +10426,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10300,8 +10440,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10316,7 +10456,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10326,10 +10482,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10410,8 +10566,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10424,8 +10580,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10441,8 +10597,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -10455,8 +10611,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -10470,10 +10640,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -10542,8 +10712,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10556,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10570,8 +10740,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10585,7 +10755,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -10600,7 +10770,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -10614,8 +10784,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -10629,10 +10813,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -10785,8 +10969,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10799,8 +10983,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10813,8 +10997,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10828,7 +11012,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -10842,7 +11026,23 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10852,10 +11052,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -10943,8 +11143,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10957,8 +11157,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10971,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -10987,7 +11187,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10997,9 +11213,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11054,8 +11270,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11068,8 +11284,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11082,8 +11298,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11098,7 +11314,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11108,11 +11340,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11176,8 +11408,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11190,8 +11422,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11204,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11220,7 +11452,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,11 +11478,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11285,8 +11533,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11299,8 +11547,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11313,8 +11561,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11329,7 +11577,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11339,11 +11603,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11407,8 +11671,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11421,8 +11685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11435,8 +11699,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11451,7 +11715,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11461,9 +11741,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -11510,8 +11790,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11524,8 +11804,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11538,8 +11818,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11554,7 +11834,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11564,9 +11860,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -11622,8 +11918,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11636,8 +11932,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11652,7 +11948,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11662,10 +11974,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -11732,8 +12044,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11746,8 +12058,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11760,8 +12072,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11775,7 +12087,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -11790,7 +12102,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -11804,8 +12116,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -11819,10 +12145,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -11891,8 +12217,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11905,8 +12231,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11919,8 +12245,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11934,7 +12260,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -11948,7 +12274,23 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11958,10 +12300,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12035,8 +12377,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12049,8 +12391,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12063,8 +12405,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12080,8 +12422,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12094,8 +12436,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12109,9 +12465,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12178,8 +12534,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12192,8 +12548,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12206,8 +12562,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12222,7 +12578,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12232,9 +12604,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12289,8 +12661,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12303,8 +12675,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12317,8 +12689,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12333,7 +12705,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12343,9 +12731,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -12443,8 +12831,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12457,8 +12845,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12471,8 +12859,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12487,7 +12875,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12497,11 +12901,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -12562,8 +12966,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12576,8 +12980,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12590,8 +12994,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12607,8 +13011,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -12621,8 +13025,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -12636,11 +13054,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -12698,8 +13116,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12712,8 +13130,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12726,8 +13144,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12742,7 +13160,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12752,11 +13186,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -12813,8 +13247,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12827,8 +13261,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12841,8 +13275,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12857,7 +13291,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12867,9 +13317,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -12945,8 +13395,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12959,8 +13409,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12973,8 +13423,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12989,7 +13439,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12999,9 +13465,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13057,8 +13523,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13071,8 +13537,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13085,8 +13551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13101,7 +13567,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13111,9 +13593,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13161,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13175,8 +13657,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13189,8 +13671,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13205,7 +13687,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13215,11 +13713,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13283,8 +13781,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13297,8 +13795,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13311,8 +13809,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13327,7 +13825,23 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13337,9 +13851,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -13385,8 +13899,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13399,8 +13913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13413,8 +13927,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13430,8 +13944,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -13444,8 +13958,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -13459,9 +13987,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -13509,8 +14037,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13523,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13537,8 +14065,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13554,8 +14082,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -13568,8 +14096,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -13583,9 +14125,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000040-modeler-post-processor-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
index 1f800df..628438e 100644
--- a/test/scenarios/datafactory/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000040-modeler-post-processor-post.yaml b/test/scenarios/datafactory/output/clicommon-000040-modeler-post-processor-post.yaml
index 3fc2227..d5a5234 100644
--- a/test/scenarios/datafactory/output/clicommon-000040-modeler-post-processor-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000040-modeler-post-processor-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2754,7 +2764,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2763,7 +2772,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2916,7 +2924,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2925,7 +2932,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3164,7 +3170,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3838,7 +3844,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3876,7 +3882,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3914,7 +3920,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3965,7 +3971,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4062,7 +4068,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4110,7 +4116,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7057,7 +7063,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7095,7 +7101,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7144,7 +7150,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7184,7 +7190,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7235,7 +7241,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8292,7 +8298,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8381,7 +8387,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8409,7 +8415,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8447,7 +8453,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8605,7 +8611,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8634,7 +8640,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9586,7 +9592,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9597,7 +9620,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9799,7 +9822,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9817,8 +9840,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9832,8 +9855,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9847,7 +9885,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9934,8 +9972,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9951,7 +9989,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9961,9 +10016,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10066,8 +10121,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10081,8 +10136,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10097,7 +10152,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10113,7 +10168,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10128,8 +10183,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10143,9 +10213,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -10214,8 +10284,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10229,8 +10299,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10247,8 +10317,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -10262,8 +10332,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -10277,8 +10362,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -10349,8 +10434,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10364,8 +10449,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10380,7 +10465,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -10395,7 +10480,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10405,9 +10507,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -10494,8 +10596,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10509,8 +10611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10526,7 +10628,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10536,8 +10655,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10592,8 +10711,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10607,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10625,8 +10744,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10640,8 +10759,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10655,10 +10789,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10718,8 +10852,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10733,8 +10867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10751,7 +10885,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10766,8 +10900,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10781,10 +10930,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10863,8 +11012,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10878,8 +11027,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10895,7 +11044,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10905,10 +11071,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10990,8 +11156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11005,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11023,8 +11189,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11038,8 +11204,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11053,10 +11234,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11126,8 +11307,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11141,8 +11322,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11156,8 +11337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11172,7 +11353,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -11188,7 +11369,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -11203,8 +11384,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -11218,10 +11414,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -11375,8 +11571,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11390,8 +11586,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11405,8 +11601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11421,7 +11617,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -11436,7 +11632,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11446,10 +11659,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -11538,8 +11751,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11553,8 +11766,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11568,8 +11781,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11585,7 +11798,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11595,9 +11825,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11653,8 +11883,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11668,8 +11898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11683,8 +11913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11700,7 +11930,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11710,11 +11957,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11779,8 +12026,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11794,8 +12041,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11809,8 +12056,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11826,7 +12073,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11836,11 +12100,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11892,8 +12156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11907,8 +12171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11922,8 +12186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11939,7 +12203,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11949,11 +12230,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12018,8 +12299,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12033,8 +12314,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12048,8 +12329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12065,7 +12346,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12075,9 +12373,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12125,8 +12423,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12140,8 +12438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12155,8 +12453,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12172,7 +12470,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12182,9 +12497,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -12242,8 +12557,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12257,8 +12572,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12274,7 +12589,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12284,10 +12616,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -12355,8 +12687,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12370,8 +12702,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12385,8 +12717,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12401,7 +12733,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -12417,7 +12749,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -12432,8 +12764,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -12447,10 +12794,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -12520,8 +12867,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12535,8 +12882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12550,8 +12897,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12566,7 +12913,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -12581,7 +12928,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12591,10 +12955,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12669,8 +13033,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12684,8 +13048,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12699,8 +13063,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12717,8 +13081,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12732,8 +13096,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12747,9 +13126,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12817,8 +13196,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12832,8 +13211,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12847,8 +13226,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12864,7 +13243,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12874,9 +13270,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12932,8 +13328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12947,8 +13343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12962,8 +13358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12979,7 +13375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12989,9 +13402,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13090,8 +13503,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13105,8 +13518,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13120,8 +13533,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13137,7 +13550,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13147,11 +13577,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -13213,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13228,8 +13658,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13243,8 +13673,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13261,8 +13691,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -13276,8 +13706,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -13291,11 +13736,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13354,8 +13799,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13369,8 +13814,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13384,8 +13829,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13401,7 +13846,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13411,11 +13873,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13473,8 +13935,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13488,8 +13950,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13503,8 +13965,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13520,7 +13982,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13530,9 +14009,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -13609,8 +14088,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13624,8 +14103,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13639,8 +14118,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13656,7 +14135,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13666,9 +14162,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13725,8 +14221,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13740,8 +14236,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13755,8 +14251,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13772,7 +14268,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13782,9 +14295,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13833,8 +14346,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13848,8 +14361,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13863,8 +14376,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13880,7 +14393,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13890,11 +14420,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13959,8 +14489,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13974,8 +14504,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13989,8 +14519,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14006,7 +14536,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14016,9 +14563,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14065,8 +14612,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14080,8 +14627,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14095,8 +14642,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14113,8 +14660,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14128,8 +14675,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14143,9 +14705,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -14194,8 +14756,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14209,8 +14771,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14224,8 +14786,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14242,8 +14804,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -14257,8 +14819,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -14272,9 +14849,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000050-m4-flatten-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000050-m4-flatten-pre-simplified.yaml
index 1f800df..628438e 100644
--- a/test/scenarios/datafactory/output/clicommon-000050-m4-flatten-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000050-m4-flatten-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000050-m4-flatten-pre.yaml b/test/scenarios/datafactory/output/clicommon-000050-m4-flatten-pre.yaml
index 3fc2227..d5a5234 100644
--- a/test/scenarios/datafactory/output/clicommon-000050-m4-flatten-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000050-m4-flatten-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2754,7 +2764,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2763,7 +2772,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2916,7 +2924,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2925,7 +2932,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3164,7 +3170,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3838,7 +3844,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3876,7 +3882,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3914,7 +3920,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3965,7 +3971,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4062,7 +4068,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4110,7 +4116,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7057,7 +7063,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7095,7 +7101,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7144,7 +7150,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7184,7 +7190,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7235,7 +7241,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8292,7 +8298,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8381,7 +8387,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8409,7 +8415,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8447,7 +8453,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8605,7 +8611,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8634,7 +8640,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9586,7 +9592,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9597,7 +9620,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9799,7 +9822,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9817,8 +9840,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9832,8 +9855,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9847,7 +9885,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9934,8 +9972,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9951,7 +9989,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9961,9 +10016,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10066,8 +10121,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10081,8 +10136,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10097,7 +10152,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10113,7 +10168,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10128,8 +10183,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10143,9 +10213,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -10214,8 +10284,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10229,8 +10299,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10247,8 +10317,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -10262,8 +10332,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -10277,8 +10362,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -10349,8 +10434,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10364,8 +10449,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10380,7 +10465,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -10395,7 +10480,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10405,9 +10507,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -10494,8 +10596,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10509,8 +10611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10526,7 +10628,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10536,8 +10655,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10592,8 +10711,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10607,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10625,8 +10744,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10640,8 +10759,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10655,10 +10789,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10718,8 +10852,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10733,8 +10867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10751,7 +10885,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10766,8 +10900,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10781,10 +10930,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10863,8 +11012,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10878,8 +11027,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10895,7 +11044,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10905,10 +11071,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10990,8 +11156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11005,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11023,8 +11189,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11038,8 +11204,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11053,10 +11234,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11126,8 +11307,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11141,8 +11322,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11156,8 +11337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11172,7 +11353,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -11188,7 +11369,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -11203,8 +11384,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -11218,10 +11414,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -11375,8 +11571,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11390,8 +11586,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11405,8 +11601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11421,7 +11617,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -11436,7 +11632,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11446,10 +11659,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -11538,8 +11751,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11553,8 +11766,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11568,8 +11781,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11585,7 +11798,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11595,9 +11825,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11653,8 +11883,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11668,8 +11898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11683,8 +11913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11700,7 +11930,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11710,11 +11957,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11779,8 +12026,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11794,8 +12041,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11809,8 +12056,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11826,7 +12073,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11836,11 +12100,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11892,8 +12156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11907,8 +12171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11922,8 +12186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11939,7 +12203,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11949,11 +12230,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12018,8 +12299,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12033,8 +12314,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12048,8 +12329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12065,7 +12346,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12075,9 +12373,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12125,8 +12423,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12140,8 +12438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12155,8 +12453,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12172,7 +12470,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12182,9 +12497,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -12242,8 +12557,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12257,8 +12572,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12274,7 +12589,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12284,10 +12616,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -12355,8 +12687,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12370,8 +12702,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12385,8 +12717,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12401,7 +12733,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -12417,7 +12749,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -12432,8 +12764,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -12447,10 +12794,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -12520,8 +12867,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12535,8 +12882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12550,8 +12897,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12566,7 +12913,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -12581,7 +12928,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12591,10 +12955,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12669,8 +13033,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12684,8 +13048,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12699,8 +13063,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12717,8 +13081,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12732,8 +13096,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12747,9 +13126,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12817,8 +13196,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12832,8 +13211,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12847,8 +13226,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12864,7 +13243,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12874,9 +13270,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12932,8 +13328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12947,8 +13343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12962,8 +13358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12979,7 +13375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12989,9 +13402,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13090,8 +13503,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13105,8 +13518,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13120,8 +13533,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13137,7 +13550,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13147,11 +13577,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -13213,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13228,8 +13658,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13243,8 +13673,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13261,8 +13691,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -13276,8 +13706,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -13291,11 +13736,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13354,8 +13799,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13369,8 +13814,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13384,8 +13829,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13401,7 +13846,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13411,11 +13873,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13473,8 +13935,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13488,8 +13950,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13503,8 +13965,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13520,7 +13982,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13530,9 +14009,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -13609,8 +14088,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13624,8 +14103,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13639,8 +14118,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13656,7 +14135,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13666,9 +14162,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13725,8 +14221,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13740,8 +14236,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13755,8 +14251,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13772,7 +14268,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13782,9 +14295,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13833,8 +14346,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13848,8 +14361,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13863,8 +14376,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13880,7 +14393,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13890,11 +14420,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13959,8 +14489,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13974,8 +14504,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13989,8 +14519,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14006,7 +14536,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14016,9 +14563,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14065,8 +14612,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14080,8 +14627,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14095,8 +14642,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14113,8 +14660,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14128,8 +14675,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14143,9 +14705,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -14194,8 +14756,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14209,8 +14771,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14224,8 +14786,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14242,8 +14804,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -14257,8 +14819,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -14272,9 +14849,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000060-split-operation-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000060-split-operation-pre-simplified.yaml
index 1f800df..628438e 100644
--- a/test/scenarios/datafactory/output/clicommon-000060-split-operation-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000060-split-operation-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000060-split-operation-pre.yaml b/test/scenarios/datafactory/output/clicommon-000060-split-operation-pre.yaml
index 3fc2227..d5a5234 100644
--- a/test/scenarios/datafactory/output/clicommon-000060-split-operation-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000060-split-operation-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2754,7 +2764,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2763,7 +2772,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2916,7 +2924,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2925,7 +2932,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3164,7 +3170,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3838,7 +3844,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3876,7 +3882,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3914,7 +3920,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3965,7 +3971,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4062,7 +4068,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4110,7 +4116,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7057,7 +7063,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7095,7 +7101,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7144,7 +7150,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7184,7 +7190,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7235,7 +7241,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8292,7 +8298,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8381,7 +8387,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8409,7 +8415,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8447,7 +8453,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8605,7 +8611,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8634,7 +8640,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9586,7 +9592,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9597,7 +9620,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9799,7 +9822,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9817,8 +9840,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9832,8 +9855,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9847,7 +9885,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9934,8 +9972,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9951,7 +9989,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9961,9 +10016,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10066,8 +10121,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10081,8 +10136,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10097,7 +10152,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10113,7 +10168,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10128,8 +10183,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10143,9 +10213,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -10214,8 +10284,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10229,8 +10299,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10247,8 +10317,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -10262,8 +10332,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -10277,8 +10362,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -10349,8 +10434,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10364,8 +10449,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10380,7 +10465,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -10395,7 +10480,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10405,9 +10507,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -10494,8 +10596,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10509,8 +10611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10526,7 +10628,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10536,8 +10655,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10592,8 +10711,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10607,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10625,8 +10744,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10640,8 +10759,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10655,10 +10789,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10718,8 +10852,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10733,8 +10867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10751,7 +10885,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10766,8 +10900,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10781,10 +10930,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10863,8 +11012,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10878,8 +11027,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10895,7 +11044,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10905,10 +11071,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10990,8 +11156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11005,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11023,8 +11189,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11038,8 +11204,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11053,10 +11234,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11126,8 +11307,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11141,8 +11322,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11156,8 +11337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11172,7 +11353,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -11188,7 +11369,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -11203,8 +11384,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -11218,10 +11414,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -11375,8 +11571,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11390,8 +11586,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11405,8 +11601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11421,7 +11617,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -11436,7 +11632,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11446,10 +11659,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -11538,8 +11751,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11553,8 +11766,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11568,8 +11781,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11585,7 +11798,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11595,9 +11825,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11653,8 +11883,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11668,8 +11898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11683,8 +11913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11700,7 +11930,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11710,11 +11957,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11779,8 +12026,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11794,8 +12041,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11809,8 +12056,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11826,7 +12073,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11836,11 +12100,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11892,8 +12156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11907,8 +12171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11922,8 +12186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11939,7 +12203,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11949,11 +12230,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12018,8 +12299,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12033,8 +12314,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12048,8 +12329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12065,7 +12346,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12075,9 +12373,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12125,8 +12423,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12140,8 +12438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12155,8 +12453,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12172,7 +12470,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12182,9 +12497,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -12242,8 +12557,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12257,8 +12572,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12274,7 +12589,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12284,10 +12616,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -12355,8 +12687,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12370,8 +12702,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12385,8 +12717,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12401,7 +12733,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -12417,7 +12749,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -12432,8 +12764,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -12447,10 +12794,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -12520,8 +12867,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12535,8 +12882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12550,8 +12897,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12566,7 +12913,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -12581,7 +12928,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12591,10 +12955,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12669,8 +13033,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12684,8 +13048,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12699,8 +13063,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12717,8 +13081,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12732,8 +13096,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12747,9 +13126,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12817,8 +13196,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12832,8 +13211,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12847,8 +13226,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12864,7 +13243,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12874,9 +13270,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12932,8 +13328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12947,8 +13343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12962,8 +13358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12979,7 +13375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12989,9 +13402,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13090,8 +13503,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13105,8 +13518,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13120,8 +13533,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13137,7 +13550,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13147,11 +13577,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -13213,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13228,8 +13658,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13243,8 +13673,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13261,8 +13691,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -13276,8 +13706,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -13291,11 +13736,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13354,8 +13799,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13369,8 +13814,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13384,8 +13829,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13401,7 +13846,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13411,11 +13873,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13473,8 +13935,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13488,8 +13950,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13503,8 +13965,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13520,7 +13982,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13530,9 +14009,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -13609,8 +14088,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13624,8 +14103,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13639,8 +14118,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13656,7 +14135,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13666,9 +14162,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13725,8 +14221,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13740,8 +14236,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13755,8 +14251,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13772,7 +14268,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13782,9 +14295,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13833,8 +14346,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13848,8 +14361,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13863,8 +14376,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13880,7 +14393,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13890,11 +14420,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13959,8 +14489,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13974,8 +14504,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13989,8 +14519,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14006,7 +14536,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14016,9 +14563,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14065,8 +14612,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14080,8 +14627,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14095,8 +14642,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14113,8 +14660,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14128,8 +14675,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14143,9 +14705,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -14194,8 +14756,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14209,8 +14771,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14224,8 +14786,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14242,8 +14804,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -14257,8 +14819,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -14272,9 +14849,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000070-split-operation-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000070-split-operation-post-simplified.yaml
index 1f800df..628438e 100644
--- a/test/scenarios/datafactory/output/clicommon-000070-split-operation-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000070-split-operation-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000070-split-operation-post.yaml b/test/scenarios/datafactory/output/clicommon-000070-split-operation-post.yaml
index 3fc2227..d5a5234 100644
--- a/test/scenarios/datafactory/output/clicommon-000070-split-operation-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000070-split-operation-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2754,7 +2764,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2763,7 +2772,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2916,7 +2924,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2925,7 +2932,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3164,7 +3170,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3838,7 +3844,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3876,7 +3882,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3914,7 +3920,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3965,7 +3971,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4062,7 +4068,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4110,7 +4116,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7057,7 +7063,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7095,7 +7101,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7144,7 +7150,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7184,7 +7190,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7235,7 +7241,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8292,7 +8298,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8381,7 +8387,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8409,7 +8415,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8447,7 +8453,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8605,7 +8611,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8634,7 +8640,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9586,7 +9592,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9597,7 +9620,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9799,7 +9822,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9817,8 +9840,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9832,8 +9855,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9847,7 +9885,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9934,8 +9972,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9951,7 +9989,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9961,9 +10016,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10066,8 +10121,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10081,8 +10136,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10097,7 +10152,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10113,7 +10168,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10128,8 +10183,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10143,9 +10213,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -10214,8 +10284,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10229,8 +10299,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10247,8 +10317,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -10262,8 +10332,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -10277,8 +10362,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -10349,8 +10434,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10364,8 +10449,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10380,7 +10465,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -10395,7 +10480,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10405,9 +10507,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -10494,8 +10596,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10509,8 +10611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10526,7 +10628,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10536,8 +10655,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10592,8 +10711,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10607,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10625,8 +10744,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10640,8 +10759,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10655,10 +10789,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10718,8 +10852,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10733,8 +10867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10751,7 +10885,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10766,8 +10900,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10781,10 +10930,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10863,8 +11012,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10878,8 +11027,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10895,7 +11044,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10905,10 +11071,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10990,8 +11156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11005,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11023,8 +11189,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11038,8 +11204,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11053,10 +11234,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11126,8 +11307,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11141,8 +11322,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11156,8 +11337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11172,7 +11353,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -11188,7 +11369,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -11203,8 +11384,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -11218,10 +11414,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -11375,8 +11571,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11390,8 +11586,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11405,8 +11601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11421,7 +11617,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -11436,7 +11632,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11446,10 +11659,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -11538,8 +11751,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11553,8 +11766,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11568,8 +11781,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11585,7 +11798,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11595,9 +11825,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11653,8 +11883,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11668,8 +11898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11683,8 +11913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11700,7 +11930,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11710,11 +11957,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11779,8 +12026,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11794,8 +12041,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11809,8 +12056,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11826,7 +12073,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11836,11 +12100,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11892,8 +12156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11907,8 +12171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11922,8 +12186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11939,7 +12203,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11949,11 +12230,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12018,8 +12299,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12033,8 +12314,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12048,8 +12329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12065,7 +12346,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12075,9 +12373,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12125,8 +12423,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12140,8 +12438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12155,8 +12453,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12172,7 +12470,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12182,9 +12497,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -12242,8 +12557,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12257,8 +12572,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12274,7 +12589,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12284,10 +12616,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -12355,8 +12687,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12370,8 +12702,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12385,8 +12717,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12401,7 +12733,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -12417,7 +12749,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -12432,8 +12764,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -12447,10 +12794,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -12520,8 +12867,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12535,8 +12882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12550,8 +12897,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12566,7 +12913,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -12581,7 +12928,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12591,10 +12955,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12669,8 +13033,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12684,8 +13048,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12699,8 +13063,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12717,8 +13081,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12732,8 +13096,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12747,9 +13126,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12817,8 +13196,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12832,8 +13211,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12847,8 +13226,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12864,7 +13243,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12874,9 +13270,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12932,8 +13328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12947,8 +13343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12962,8 +13358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12979,7 +13375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12989,9 +13402,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13090,8 +13503,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13105,8 +13518,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13120,8 +13533,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13137,7 +13550,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13147,11 +13577,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -13213,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13228,8 +13658,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13243,8 +13673,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13261,8 +13691,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -13276,8 +13706,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -13291,11 +13736,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13354,8 +13799,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13369,8 +13814,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13384,8 +13829,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13401,7 +13846,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13411,11 +13873,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13473,8 +13935,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13488,8 +13950,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13503,8 +13965,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13520,7 +13982,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13530,9 +14009,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -13609,8 +14088,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13624,8 +14103,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13639,8 +14118,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13656,7 +14135,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13666,9 +14162,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13725,8 +14221,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13740,8 +14236,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13755,8 +14251,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13772,7 +14268,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13782,9 +14295,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13833,8 +14346,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13848,8 +14361,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13863,8 +14376,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13880,7 +14393,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13890,11 +14420,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13959,8 +14489,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13974,8 +14504,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13989,8 +14519,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14006,7 +14536,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14016,9 +14563,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14065,8 +14612,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14080,8 +14627,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14095,8 +14642,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14113,8 +14660,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14128,8 +14675,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14143,9 +14705,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -14194,8 +14756,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14209,8 +14771,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14224,8 +14786,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14242,8 +14804,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -14257,8 +14819,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -14272,9 +14849,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000080-m4-flatten-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000080-m4-flatten-post-simplified.yaml
index 1f800df..628438e 100644
--- a/test/scenarios/datafactory/output/clicommon-000080-m4-flatten-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000080-m4-flatten-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000080-m4-flatten-post.yaml b/test/scenarios/datafactory/output/clicommon-000080-m4-flatten-post.yaml
index 3fc2227..d5a5234 100644
--- a/test/scenarios/datafactory/output/clicommon-000080-m4-flatten-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000080-m4-flatten-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2754,7 +2764,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2763,7 +2772,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2916,7 +2924,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2925,7 +2932,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3164,7 +3170,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3838,7 +3844,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3876,7 +3882,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3914,7 +3920,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3965,7 +3971,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4062,7 +4068,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4110,7 +4116,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7057,7 +7063,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7095,7 +7101,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7144,7 +7150,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7184,7 +7190,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7235,7 +7241,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8292,7 +8298,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8381,7 +8387,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8409,7 +8415,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8447,7 +8453,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8605,7 +8611,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8634,7 +8640,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9586,7 +9592,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9597,7 +9620,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9799,7 +9822,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9817,8 +9840,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9832,8 +9855,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9847,7 +9885,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9934,8 +9972,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9951,7 +9989,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9961,9 +10016,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10066,8 +10121,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10081,8 +10136,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10097,7 +10152,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10113,7 +10168,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10128,8 +10183,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10143,9 +10213,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -10214,8 +10284,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10229,8 +10299,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10247,8 +10317,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -10262,8 +10332,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -10277,8 +10362,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -10349,8 +10434,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10364,8 +10449,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10380,7 +10465,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -10395,7 +10480,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10405,9 +10507,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -10494,8 +10596,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10509,8 +10611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10526,7 +10628,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10536,8 +10655,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10592,8 +10711,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10607,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10625,8 +10744,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10640,8 +10759,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10655,10 +10789,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10718,8 +10852,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10733,8 +10867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10751,7 +10885,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10766,8 +10900,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10781,10 +10930,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10863,8 +11012,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10878,8 +11027,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10895,7 +11044,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10905,10 +11071,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10990,8 +11156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11005,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11023,8 +11189,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11038,8 +11204,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11053,10 +11234,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11126,8 +11307,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11141,8 +11322,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11156,8 +11337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11172,7 +11353,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -11188,7 +11369,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -11203,8 +11384,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -11218,10 +11414,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -11375,8 +11571,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11390,8 +11586,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11405,8 +11601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11421,7 +11617,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -11436,7 +11632,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11446,10 +11659,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -11538,8 +11751,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11553,8 +11766,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11568,8 +11781,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11585,7 +11798,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11595,9 +11825,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11653,8 +11883,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11668,8 +11898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11683,8 +11913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11700,7 +11930,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11710,11 +11957,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11779,8 +12026,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11794,8 +12041,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11809,8 +12056,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11826,7 +12073,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11836,11 +12100,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11892,8 +12156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11907,8 +12171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11922,8 +12186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11939,7 +12203,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11949,11 +12230,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12018,8 +12299,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12033,8 +12314,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12048,8 +12329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12065,7 +12346,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12075,9 +12373,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12125,8 +12423,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12140,8 +12438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12155,8 +12453,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12172,7 +12470,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12182,9 +12497,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -12242,8 +12557,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12257,8 +12572,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12274,7 +12589,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12284,10 +12616,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -12355,8 +12687,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12370,8 +12702,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12385,8 +12717,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12401,7 +12733,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -12417,7 +12749,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -12432,8 +12764,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -12447,10 +12794,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -12520,8 +12867,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12535,8 +12882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12550,8 +12897,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12566,7 +12913,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -12581,7 +12928,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12591,10 +12955,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12669,8 +13033,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12684,8 +13048,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12699,8 +13063,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12717,8 +13081,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12732,8 +13096,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12747,9 +13126,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12817,8 +13196,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12832,8 +13211,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12847,8 +13226,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12864,7 +13243,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12874,9 +13270,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12932,8 +13328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12947,8 +13343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12962,8 +13358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12979,7 +13375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12989,9 +13402,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13090,8 +13503,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13105,8 +13518,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13120,8 +13533,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13137,7 +13550,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13147,11 +13577,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -13213,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13228,8 +13658,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13243,8 +13673,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13261,8 +13691,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -13276,8 +13706,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -13291,11 +13736,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13354,8 +13799,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13369,8 +13814,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13384,8 +13829,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13401,7 +13846,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13411,11 +13873,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13473,8 +13935,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13488,8 +13950,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13503,8 +13965,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13520,7 +13982,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13530,9 +14009,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -13609,8 +14088,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13624,8 +14103,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13639,8 +14118,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13656,7 +14135,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13666,9 +14162,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13725,8 +14221,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13740,8 +14236,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13755,8 +14251,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13772,7 +14268,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13782,9 +14295,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13833,8 +14346,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13848,8 +14361,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13863,8 +14376,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13880,7 +14393,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13890,11 +14420,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13959,8 +14489,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13974,8 +14504,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13989,8 +14519,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14006,7 +14536,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14016,9 +14563,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14065,8 +14612,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14080,8 +14627,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14095,8 +14642,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14113,8 +14660,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14128,8 +14675,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14143,9 +14705,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -14194,8 +14756,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14209,8 +14771,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14224,8 +14786,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14242,8 +14804,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -14257,8 +14819,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -14272,9 +14849,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000090-complex-marker-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000090-complex-marker-pre-simplified.yaml
index 1f800df..628438e 100644
--- a/test/scenarios/datafactory/output/clicommon-000090-complex-marker-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000090-complex-marker-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000090-complex-marker-pre.yaml b/test/scenarios/datafactory/output/clicommon-000090-complex-marker-pre.yaml
index 3fc2227..d5a5234 100644
--- a/test/scenarios/datafactory/output/clicommon-000090-complex-marker-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000090-complex-marker-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2754,7 +2764,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2763,7 +2772,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2916,7 +2924,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2925,7 +2932,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3164,7 +3170,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3838,7 +3844,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3876,7 +3882,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3914,7 +3920,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3965,7 +3971,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4062,7 +4068,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4110,7 +4116,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7057,7 +7063,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7095,7 +7101,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7144,7 +7150,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7184,7 +7190,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7235,7 +7241,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8292,7 +8298,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8381,7 +8387,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8409,7 +8415,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8447,7 +8453,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8605,7 +8611,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8634,7 +8640,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9586,7 +9592,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9597,7 +9620,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9799,7 +9822,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9817,8 +9840,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9832,8 +9855,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9847,7 +9885,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9934,8 +9972,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9951,7 +9989,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9961,9 +10016,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10066,8 +10121,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10081,8 +10136,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10097,7 +10152,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10113,7 +10168,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10128,8 +10183,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10143,9 +10213,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -10214,8 +10284,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10229,8 +10299,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10247,8 +10317,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -10262,8 +10332,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -10277,8 +10362,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -10349,8 +10434,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10364,8 +10449,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10380,7 +10465,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -10395,7 +10480,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10405,9 +10507,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -10494,8 +10596,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10509,8 +10611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10526,7 +10628,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10536,8 +10655,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10592,8 +10711,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10607,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10625,8 +10744,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10640,8 +10759,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10655,10 +10789,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10718,8 +10852,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10733,8 +10867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10751,7 +10885,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10766,8 +10900,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10781,10 +10930,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10863,8 +11012,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10878,8 +11027,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10895,7 +11044,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10905,10 +11071,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10990,8 +11156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11005,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11023,8 +11189,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11038,8 +11204,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11053,10 +11234,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11126,8 +11307,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11141,8 +11322,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11156,8 +11337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11172,7 +11353,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -11188,7 +11369,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -11203,8 +11384,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -11218,10 +11414,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -11375,8 +11571,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11390,8 +11586,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11405,8 +11601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11421,7 +11617,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -11436,7 +11632,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11446,10 +11659,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -11538,8 +11751,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11553,8 +11766,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11568,8 +11781,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11585,7 +11798,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11595,9 +11825,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11653,8 +11883,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11668,8 +11898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11683,8 +11913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11700,7 +11930,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11710,11 +11957,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11779,8 +12026,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11794,8 +12041,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11809,8 +12056,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11826,7 +12073,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11836,11 +12100,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11892,8 +12156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11907,8 +12171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11922,8 +12186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11939,7 +12203,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11949,11 +12230,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12018,8 +12299,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12033,8 +12314,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12048,8 +12329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12065,7 +12346,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12075,9 +12373,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12125,8 +12423,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12140,8 +12438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12155,8 +12453,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12172,7 +12470,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12182,9 +12497,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -12242,8 +12557,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12257,8 +12572,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12274,7 +12589,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12284,10 +12616,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -12355,8 +12687,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12370,8 +12702,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12385,8 +12717,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12401,7 +12733,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -12417,7 +12749,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -12432,8 +12764,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -12447,10 +12794,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -12520,8 +12867,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12535,8 +12882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12550,8 +12897,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12566,7 +12913,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -12581,7 +12928,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12591,10 +12955,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12669,8 +13033,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12684,8 +13048,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12699,8 +13063,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12717,8 +13081,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12732,8 +13096,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12747,9 +13126,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12817,8 +13196,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12832,8 +13211,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12847,8 +13226,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12864,7 +13243,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12874,9 +13270,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12932,8 +13328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12947,8 +13343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12962,8 +13358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12979,7 +13375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12989,9 +13402,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13090,8 +13503,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13105,8 +13518,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13120,8 +13533,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13137,7 +13550,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13147,11 +13577,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -13213,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13228,8 +13658,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13243,8 +13673,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13261,8 +13691,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -13276,8 +13706,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -13291,11 +13736,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13354,8 +13799,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13369,8 +13814,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13384,8 +13829,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13401,7 +13846,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13411,11 +13873,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13473,8 +13935,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13488,8 +13950,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13503,8 +13965,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13520,7 +13982,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13530,9 +14009,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -13609,8 +14088,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13624,8 +14103,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13639,8 +14118,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13656,7 +14135,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13666,9 +14162,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13725,8 +14221,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13740,8 +14236,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13755,8 +14251,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13772,7 +14268,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13782,9 +14295,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13833,8 +14346,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13848,8 +14361,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13863,8 +14376,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13880,7 +14393,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13890,11 +14420,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13959,8 +14489,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13974,8 +14504,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13989,8 +14519,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14006,7 +14536,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14016,9 +14563,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14065,8 +14612,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14080,8 +14627,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14095,8 +14642,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14113,8 +14660,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14128,8 +14675,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14143,9 +14705,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -14194,8 +14756,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14209,8 +14771,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14224,8 +14786,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14242,8 +14804,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -14257,8 +14819,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -14272,9 +14849,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000100-complex-marker-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000100-complex-marker-post-simplified.yaml
index 1021dcf..d6fc86a 100644
--- a/test/scenarios/datafactory/output/clicommon-000100-complex-marker-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000100-complex-marker-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000100-complex-marker-post.yaml b/test/scenarios/datafactory/output/clicommon-000100-complex-marker-post.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000100-complex-marker-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000100-complex-marker-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000110-m4namer-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000110-m4namer-pre-simplified.yaml
index 1f800df..628438e 100644
--- a/test/scenarios/datafactory/output/clicommon-000110-m4namer-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000110-m4namer-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000110-m4namer-pre.yaml b/test/scenarios/datafactory/output/clicommon-000110-m4namer-pre.yaml
index 3fc2227..d5a5234 100644
--- a/test/scenarios/datafactory/output/clicommon-000110-m4namer-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000110-m4namer-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2754,7 +2764,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2763,7 +2772,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2916,7 +2924,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2925,7 +2932,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3164,7 +3170,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3838,7 +3844,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3876,7 +3882,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3914,7 +3920,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3965,7 +3971,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4062,7 +4068,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4110,7 +4116,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7057,7 +7063,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7095,7 +7101,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7144,7 +7150,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7184,7 +7190,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7235,7 +7241,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8292,7 +8298,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8381,7 +8387,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8409,7 +8415,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8447,7 +8453,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8605,7 +8611,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8634,7 +8640,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9586,7 +9592,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9597,7 +9620,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -9799,7 +9822,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -9817,8 +9840,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -9832,8 +9855,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -9847,7 +9885,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -9934,8 +9972,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -9951,7 +9989,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -9961,9 +10016,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10066,8 +10121,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10081,8 +10136,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10097,7 +10152,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10113,7 +10168,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10128,8 +10183,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10143,9 +10213,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -10214,8 +10284,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10229,8 +10299,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10247,8 +10317,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -10262,8 +10332,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -10277,8 +10362,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -10349,8 +10434,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10364,8 +10449,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10380,7 +10465,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -10395,7 +10480,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10405,9 +10507,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -10494,8 +10596,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10509,8 +10611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10526,7 +10628,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10536,8 +10655,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -10592,8 +10711,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10607,8 +10726,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10625,8 +10744,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -10640,8 +10759,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -10655,10 +10789,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -10718,8 +10852,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10733,8 +10867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10751,7 +10885,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -10766,8 +10900,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -10781,10 +10930,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -10863,8 +11012,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10878,8 +11027,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10895,7 +11044,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10905,10 +11071,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -10990,8 +11156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11005,8 +11171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11023,8 +11189,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11038,8 +11204,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11053,10 +11234,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11126,8 +11307,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11141,8 +11322,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11156,8 +11337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11172,7 +11353,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -11188,7 +11369,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -11203,8 +11384,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -11218,10 +11414,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -11375,8 +11571,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11390,8 +11586,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11405,8 +11601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11421,7 +11617,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -11436,7 +11632,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11446,10 +11659,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -11538,8 +11751,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11553,8 +11766,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11568,8 +11781,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11585,7 +11798,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11595,9 +11825,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -11653,8 +11883,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11668,8 +11898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11683,8 +11913,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11700,7 +11930,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11710,11 +11957,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11779,8 +12026,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11794,8 +12041,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11809,8 +12056,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11826,7 +12073,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11836,11 +12100,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -11892,8 +12156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11907,8 +12171,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11922,8 +12186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11939,7 +12203,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11949,11 +12230,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12018,8 +12299,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12033,8 +12314,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12048,8 +12329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12065,7 +12346,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12075,9 +12373,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12125,8 +12423,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12140,8 +12438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12155,8 +12453,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12172,7 +12470,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12182,9 +12497,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -12242,8 +12557,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12257,8 +12572,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12274,7 +12589,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12284,10 +12616,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -12355,8 +12687,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12370,8 +12702,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12385,8 +12717,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12401,7 +12733,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -12417,7 +12749,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -12432,8 +12764,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -12447,10 +12794,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -12520,8 +12867,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12535,8 +12882,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12550,8 +12897,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12566,7 +12913,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -12581,7 +12928,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12591,10 +12955,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -12669,8 +13033,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12684,8 +13048,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12699,8 +13063,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12717,8 +13081,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -12732,8 +13096,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -12747,9 +13126,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -12817,8 +13196,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12832,8 +13211,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12847,8 +13226,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12864,7 +13243,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12874,9 +13270,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -12932,8 +13328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12947,8 +13343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12962,8 +13358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12979,7 +13375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12989,9 +13402,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13090,8 +13503,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13105,8 +13518,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13120,8 +13533,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13137,7 +13550,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13147,11 +13577,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -13213,8 +13643,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13228,8 +13658,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13243,8 +13673,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13261,8 +13691,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -13276,8 +13706,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -13291,11 +13736,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13354,8 +13799,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13369,8 +13814,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13384,8 +13829,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13401,7 +13846,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13411,11 +13873,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -13473,8 +13935,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13488,8 +13950,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13503,8 +13965,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13520,7 +13982,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13530,9 +14009,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -13609,8 +14088,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13624,8 +14103,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13639,8 +14118,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13656,7 +14135,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13666,9 +14162,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -13725,8 +14221,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13740,8 +14236,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13755,8 +14251,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13772,7 +14268,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13782,9 +14295,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -13833,8 +14346,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13848,8 +14361,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13863,8 +14376,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13880,7 +14393,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13890,11 +14420,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -13959,8 +14489,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13974,8 +14504,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13989,8 +14519,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14006,7 +14536,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14016,9 +14563,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14065,8 +14612,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14080,8 +14627,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14095,8 +14642,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14113,8 +14660,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14128,8 +14675,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14143,9 +14705,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -14194,8 +14756,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14209,8 +14771,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14224,8 +14786,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14242,8 +14804,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -14257,8 +14819,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -14272,9 +14849,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000120-m4namer-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000120-m4namer-post-simplified.yaml
index 7a5c67d..31af552 100644
--- a/test/scenarios/datafactory/output/clicommon-000120-m4namer-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000120-m4namer-post-simplified.yaml
@@ -27,6 +27,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -59,6 +64,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
                 cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: FactoryRepoUpdate
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -85,6 +95,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -127,6 +142,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
                 cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: Factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -164,6 +184,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
                 cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: FactoryUpdateParameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -200,6 +225,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -231,6 +261,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -268,6 +303,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
                 cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: GitHubAccessTokenRequest
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -305,6 +345,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
                 cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: UserAccessPolicy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: Triggers
       cli:
         cliKey: Triggers
@@ -342,6 +387,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -379,6 +429,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
                 cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: TriggerFilterParameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -426,6 +481,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
                 cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: TriggerResource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -467,6 +527,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -503,6 +568,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -539,6 +609,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -575,6 +650,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -611,6 +691,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -647,6 +732,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -683,6 +773,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: IntegrationRuntimes
       cli:
         cliKey: IntegrationRuntimes
@@ -720,6 +815,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -767,6 +867,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: IntegrationRuntimeResource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -808,6 +913,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -850,6 +960,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: UpdateIntegrationRuntimeRequest
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -886,6 +1001,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -922,6 +1042,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -958,6 +1083,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -1000,6 +1130,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: IntegrationRuntimeRegenerateKeyParameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -1036,6 +1171,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -1072,6 +1212,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -1108,6 +1253,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -1144,6 +1294,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -1180,6 +1335,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -1216,6 +1376,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1258,6 +1423,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: LinkedIntegrationRuntimeRequest
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1300,6 +1470,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: CreateLinkedIntegrationRuntimeRequest
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000120-m4namer-post.yaml b/test/scenarios/datafactory/output/clicommon-000120-m4namer-post.yaml
index 493992f..98b1246 100644
--- a/test/scenarios/datafactory/output/clicommon-000120-m4namer-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000120-m4namer-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: FactoryRepoUpdateFactoryResourceId
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: TriggerQueryResponseContinuationToken
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2794,6 +2794,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2860,7 +2870,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ResourceTags
@@ -2869,7 +2878,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: FactoryUpdateParametersTags
@@ -3022,7 +3030,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeNodeCapabilities
@@ -3031,7 +3038,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeStatusTypePropertiesCapabilities
@@ -3270,7 +3276,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3992,7 +3998,7 @@ schemas:
           cliPath: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4033,7 +4039,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
           cliPath: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4074,7 +4080,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
           cliPath: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4129,7 +4135,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
           cliPath: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4234,7 +4240,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
           cliPath: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4286,7 +4292,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
           cliPath: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7443,7 +7449,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7484,7 +7490,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
           cliPath: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7536,7 +7542,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
           cliPath: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7579,7 +7585,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
           cliPath: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7633,7 +7639,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8770,7 +8776,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8866,7 +8872,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8896,7 +8902,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8937,7 +8943,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9107,7 +9113,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9138,7 +9144,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
           cliPath: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10159,7 +10165,25 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10170,7 +10194,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10373,7 +10397,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10392,8 +10416,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10408,8 +10432,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10423,7 +10463,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10511,8 +10551,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10529,7 +10569,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10539,9 +10597,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10645,8 +10703,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10661,8 +10719,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10678,7 +10736,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10695,7 +10753,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10711,8 +10769,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10726,9 +10800,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -10798,8 +10872,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10814,8 +10888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10833,8 +10907,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -10849,8 +10923,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -10864,8 +10954,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -10937,8 +11027,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10953,8 +11043,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10970,7 +11060,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -10986,7 +11076,25 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10996,9 +11104,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11086,8 +11194,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11102,8 +11210,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11120,7 +11228,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11130,8 +11256,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11187,8 +11313,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11203,8 +11329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11222,8 +11348,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11238,8 +11364,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11253,10 +11395,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11317,8 +11459,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11333,8 +11475,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11352,7 +11494,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11368,8 +11510,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11383,10 +11541,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11467,8 +11625,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11483,8 +11641,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11501,7 +11659,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11511,10 +11687,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11597,8 +11773,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11613,8 +11789,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11632,8 +11808,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11648,8 +11824,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11663,10 +11855,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11737,8 +11929,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11753,8 +11945,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11769,8 +11961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11786,7 +11978,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -11803,7 +11995,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -11819,8 +12011,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -11834,10 +12042,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -11992,8 +12200,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12008,8 +12216,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12024,8 +12232,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12041,7 +12249,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12057,7 +12265,25 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12067,10 +12293,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12160,8 +12386,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12176,8 +12402,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12192,8 +12418,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12210,7 +12436,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12220,9 +12464,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12279,8 +12523,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12295,8 +12539,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12311,8 +12555,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12329,7 +12573,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12339,11 +12601,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12409,8 +12671,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12425,8 +12687,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12441,8 +12703,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12459,7 +12721,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12469,11 +12749,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12526,8 +12806,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12542,8 +12822,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12558,8 +12838,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12576,7 +12856,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12586,11 +12884,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12656,8 +12954,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12672,8 +12970,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12688,8 +12986,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12706,7 +13004,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12716,9 +13032,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12767,8 +13083,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12783,8 +13099,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12799,8 +13115,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12817,7 +13133,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12827,9 +13161,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -12889,8 +13223,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12905,8 +13239,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12923,7 +13257,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12933,10 +13285,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13005,8 +13357,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13021,8 +13373,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13037,8 +13389,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13054,7 +13406,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13071,7 +13423,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13087,8 +13439,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13102,10 +13470,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13176,8 +13544,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13192,8 +13560,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13208,8 +13576,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13225,7 +13593,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13241,7 +13609,25 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13251,10 +13637,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13330,8 +13716,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13346,8 +13732,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13362,8 +13748,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13381,8 +13767,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13397,8 +13783,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13412,9 +13814,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13483,8 +13885,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13499,8 +13901,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13515,8 +13917,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13533,7 +13935,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13543,9 +13963,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13602,8 +14022,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13618,8 +14038,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13634,8 +14054,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13652,7 +14072,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13662,9 +14100,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13764,8 +14202,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13780,8 +14218,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13796,8 +14234,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13814,7 +14252,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13824,11 +14280,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -13891,8 +14347,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13907,8 +14363,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13923,8 +14379,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13942,8 +14398,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -13958,8 +14414,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -13973,11 +14445,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14037,8 +14509,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14525,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14069,8 +14541,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14087,7 +14559,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14097,11 +14587,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14160,8 +14650,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14176,8 +14666,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14192,8 +14682,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14210,7 +14700,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14220,9 +14728,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14300,8 +14808,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14316,8 +14824,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14332,8 +14840,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14350,7 +14858,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14360,9 +14886,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14420,8 +14946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14436,8 +14962,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14452,8 +14978,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14470,7 +14996,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14480,9 +15024,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14532,8 +15076,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14548,8 +15092,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14564,8 +15108,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14582,7 +15126,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14592,11 +15154,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14662,8 +15224,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14678,8 +15240,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14694,8 +15256,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14712,7 +15274,25 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14722,9 +15302,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14772,8 +15352,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14788,8 +15368,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14804,8 +15384,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14823,8 +15403,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14839,8 +15419,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14854,9 +15450,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -14906,8 +15502,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14922,8 +15518,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15534,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14957,8 +15553,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -14973,8 +15569,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -14988,9 +15600,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000130-flatten-set-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000130-flatten-set-pre-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000130-flatten-set-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000130-flatten-set-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000130-flatten-set-pre.yaml b/test/scenarios/datafactory/output/clicommon-000130-flatten-set-pre.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000130-flatten-set-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000130-flatten-set-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000140-flatten-set-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000140-flatten-set-post-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000140-flatten-set-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000140-flatten-set-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000140-flatten-set-post.yaml b/test/scenarios/datafactory/output/clicommon-000140-flatten-set-post.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000140-flatten-set-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000140-flatten-set-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000150-flatten-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000150-flatten-pre-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000150-flatten-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000150-flatten-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000150-flatten-pre.yaml b/test/scenarios/datafactory/output/clicommon-000150-flatten-pre.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000150-flatten-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000150-flatten-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000160-flatten-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000160-flatten-post-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000160-flatten-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000160-flatten-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000160-flatten-post.yaml b/test/scenarios/datafactory/output/clicommon-000160-flatten-post.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000160-flatten-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000160-flatten-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000170-poly-as-resource-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000170-poly-as-resource-pre.yaml b/test/scenarios/datafactory/output/clicommon-000170-poly-as-resource-pre.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000170-poly-as-resource-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000170-poly-as-resource-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000180-poly-as-resource-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000180-poly-as-resource-post-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000180-poly-as-resource-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000180-poly-as-resource-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000180-poly-as-resource-post.yaml b/test/scenarios/datafactory/output/clicommon-000180-poly-as-resource-post.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000180-poly-as-resource-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000180-poly-as-resource-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000190-flatten-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000190-flatten-pre-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000190-flatten-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000190-flatten-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000190-flatten-pre.yaml b/test/scenarios/datafactory/output/clicommon-000190-flatten-pre.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000190-flatten-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000190-flatten-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000200-flatten-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000200-flatten-post-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000200-flatten-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000200-flatten-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000200-flatten-post.yaml b/test/scenarios/datafactory/output/clicommon-000200-flatten-post.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000200-flatten-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000200-flatten-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000210-modifier-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000210-modifier-pre-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000210-modifier-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000210-modifier-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000210-modifier-pre.yaml b/test/scenarios/datafactory/output/clicommon-000210-modifier-pre.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000210-modifier-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000210-modifier-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000220-modifier-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000220-modifier-post-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000220-modifier-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000220-modifier-post-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000220-modifier-post.yaml b/test/scenarios/datafactory/output/clicommon-000220-modifier-post.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000220-modifier-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000220-modifier-post.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000230-namer-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000230-namer-pre-simplified.yaml
index ff693f6..d84024b 100644
--- a/test/scenarios/datafactory/output/clicommon-000230-namer-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000230-namer-pre-simplified.yaml
@@ -22,6 +22,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: configure_factory_repo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -48,6 +52,10 @@ operationGroups:
                 cliKey: factoryRepoUpdate
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: factory_repo_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -69,6 +77,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -103,6 +115,10 @@ operationGroups:
                 cliKey: factory
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: factory
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -133,6 +149,10 @@ operationGroups:
                 cliKey: factoryUpdateParameters
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: factory_update_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -162,6 +182,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -187,6 +211,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_git_hub_access_token
           cli:
             cliKey: GetGitHubAccessToken
@@ -217,6 +245,10 @@ operationGroups:
                 cliKey: gitHubAccessTokenRequest
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: git_hub_access_token_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: get_data_plane_access
           cli:
             cliKey: GetDataPlaneAccess
@@ -247,6 +279,10 @@ operationGroups:
                 cliKey: policy
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: user_access_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: triggers
       cli:
         cliKey: Triggers
@@ -277,6 +313,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: query_by_factory
           cli:
             cliKey: QueryByFactory
@@ -307,6 +347,10 @@ operationGroups:
                 cliKey: filterParameters
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: trigger_filter_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -345,6 +389,10 @@ operationGroups:
                 cliKey: trigger
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: trigger_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -378,6 +426,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -407,6 +459,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: subscribe_to_events
           cli:
             cliKey: SubscribeToEvents
@@ -436,6 +492,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: get_event_subscription_status
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -465,6 +525,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: unsubscribe_from_events
           cli:
             cliKey: UnsubscribeFromEvents
@@ -494,6 +558,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -523,6 +591,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -552,6 +624,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: integration_runtimes
       cli:
         cliKey: IntegrationRuntimes
@@ -582,6 +658,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -620,6 +700,10 @@ operationGroups:
                 cliKey: integrationRuntime
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: integration_runtime_resource
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: get
           cli:
             cliKey: Get
@@ -653,6 +737,10 @@ operationGroups:
               cli:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -687,6 +775,10 @@ operationGroups:
                 cliKey: updateIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: update_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -716,6 +808,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: get_status
           cli:
             cliKey: GetStatus
@@ -745,6 +841,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: get_connection_info
           cli:
             cliKey: GetConnectionInfo
@@ -774,6 +874,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: regenerate_auth_key
           cli:
             cliKey: RegenerateAuthKey
@@ -808,6 +912,10 @@ operationGroups:
                 cliKey: regenerateKeyParameters
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: integration_runtime_regenerate_key_parameters
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: list_auth_keys
           cli:
             cliKey: ListAuthKeys
@@ -837,6 +945,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: start
           cli:
             cliKey: Start
@@ -866,6 +978,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: stop
           cli:
             cliKey: Stop
@@ -895,6 +1011,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: sync_credentials
           cli:
             cliKey: SyncCredentials
@@ -924,6 +1044,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: get_monitoring_data
           cli:
             cliKey: GetMonitoringData
@@ -953,6 +1077,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: upgrade
           cli:
             cliKey: Upgrade
@@ -982,6 +1110,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: remove_links
           cli:
             cliKey: RemoveLinks
@@ -1016,6 +1148,10 @@ operationGroups:
                 cliKey: linkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: create_linked_integration_runtime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1050,6 +1186,10 @@ operationGroups:
                 cliKey: createLinkedIntegrationRuntimeRequest
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: create_linked_integration_runtime_request
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000230-namer-pre.yaml b/test/scenarios/datafactory/output/clicommon-000230-namer-pre.yaml
index c832084..cb29000 100644
--- a/test/scenarios/datafactory/output/clicommon-000230-namer-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000230-namer-pre.yaml
@@ -505,7 +505,7 @@ schemas:
           name: factory_repo_update_factory_resource_id
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -517,7 +517,7 @@ schemas:
           name: string
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -718,7 +718,7 @@ schemas:
           name: trigger_query_response_continuation_token
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -2688,6 +2688,16 @@ schemas:
           name: api_version2018_06_01
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -2757,7 +2767,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: resource_tags
@@ -2769,7 +2778,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: factory_update_parameters_tags
@@ -2979,7 +2987,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_node_capabilities
@@ -2991,7 +2998,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: self_hosted_integration_runtime_status_type_properties_capabilities
@@ -3233,7 +3239,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -3988,7 +3994,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4032,7 +4038,7 @@ schemas:
           cliKey: FactoryRepoUpdate
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4076,7 +4082,7 @@ schemas:
           cliKey: FactoryUpdateParameters
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4133,7 +4139,7 @@ schemas:
           cliKey: GitHubAccessTokenRequest
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4242,7 +4248,7 @@ schemas:
           cliKey: UserAccessPolicy
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -4296,7 +4302,7 @@ schemas:
           cliKey: AccessPolicyResponse
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7621,7 +7627,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7665,7 +7671,7 @@ schemas:
           cliKey: TriggerFilterParameters
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7723,7 +7729,7 @@ schemas:
           cliKey: TriggerQueryResponse
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7769,7 +7775,7 @@ schemas:
           cliKey: TriggerSubscriptionOperationStatus
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -7829,7 +7835,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -8982,7 +8988,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9077,7 +9083,7 @@ schemas:
           cliKey: IntegrationRuntimeConnectionInfo
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9111,7 +9117,7 @@ schemas:
           cliKey: IntegrationRuntimeRegenerateKeyParameters
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9155,7 +9161,7 @@ schemas:
           cliKey: IntegrationRuntimeAuthKeys
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9328,7 +9334,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9363,7 +9369,7 @@ schemas:
           cliKey: LinkedIntegrationRuntimeRequest
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -10411,7 +10417,24 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10422,7 +10445,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10624,7 +10647,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -10642,8 +10665,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -10657,8 +10680,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -10672,7 +10710,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -10759,8 +10797,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10776,7 +10814,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -10786,9 +10841,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -10891,8 +10946,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -10906,8 +10961,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -10922,7 +10977,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -10938,7 +10993,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -10953,8 +11008,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -10968,9 +11038,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -11039,8 +11109,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11054,8 +11124,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11072,8 +11142,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -11087,8 +11157,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -11102,8 +11187,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -11174,8 +11259,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11189,8 +11274,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11205,7 +11290,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -11220,7 +11305,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11230,9 +11332,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -11319,8 +11421,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11334,8 +11436,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11351,7 +11453,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11361,8 +11480,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -11417,8 +11536,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11432,8 +11551,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11450,8 +11569,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -11465,8 +11584,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -11480,10 +11614,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -11543,8 +11677,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11558,8 +11692,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11576,7 +11710,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -11591,8 +11725,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -11606,10 +11755,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -11688,8 +11837,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11703,8 +11852,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11720,7 +11869,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -11730,10 +11896,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -11815,8 +11981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11830,8 +11996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11848,8 +12014,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -11863,8 +12029,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -11878,10 +12059,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -11951,8 +12132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -11966,8 +12147,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -11981,8 +12162,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -11997,7 +12178,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -12013,7 +12194,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -12028,8 +12209,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -12043,10 +12239,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -12200,8 +12396,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12215,8 +12411,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12230,8 +12426,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12246,7 +12442,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -12261,7 +12457,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12271,10 +12484,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -12363,8 +12576,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12378,8 +12591,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12393,8 +12606,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12410,7 +12623,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12420,9 +12650,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -12478,8 +12708,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12493,8 +12723,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12508,8 +12738,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12525,7 +12755,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12535,11 +12782,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12604,8 +12851,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12619,8 +12866,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12634,8 +12881,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12651,7 +12898,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12661,11 +12925,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12717,8 +12981,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12732,8 +12996,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12747,8 +13011,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12764,7 +13028,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12774,11 +13055,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -12843,8 +13124,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12858,8 +13139,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12873,8 +13154,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12890,7 +13171,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12900,9 +13198,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -12950,8 +13248,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -12965,8 +13263,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -12980,8 +13278,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -12997,7 +13295,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13007,9 +13322,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -13067,8 +13382,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13082,8 +13397,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13099,7 +13414,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13109,10 +13441,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -13180,8 +13512,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13195,8 +13527,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13210,8 +13542,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13226,7 +13558,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -13242,7 +13574,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -13257,8 +13589,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -13272,10 +13619,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -13345,8 +13692,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13360,8 +13707,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13375,8 +13722,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13391,7 +13738,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -13406,7 +13753,24 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13416,10 +13780,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -13494,8 +13858,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13509,8 +13873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13524,8 +13888,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13542,8 +13906,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -13557,8 +13921,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -13572,9 +13951,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -13642,8 +14021,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13657,8 +14036,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13672,8 +14051,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13689,7 +14068,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13699,9 +14095,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -13757,8 +14153,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13772,8 +14168,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13787,8 +14183,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13804,7 +14200,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13814,9 +14227,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -13915,8 +14328,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13930,8 +14343,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13945,8 +14358,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13962,7 +14375,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13972,11 +14402,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -14038,8 +14468,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14053,8 +14483,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14068,8 +14498,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14086,8 +14516,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -14101,8 +14531,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -14116,11 +14561,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14179,8 +14624,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14194,8 +14639,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14209,8 +14654,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14226,7 +14671,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14236,11 +14698,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -14298,8 +14760,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14313,8 +14775,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14328,8 +14790,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14345,7 +14807,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14355,9 +14834,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -14434,8 +14913,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14449,8 +14928,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14464,8 +14943,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14481,7 +14960,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14491,9 +14987,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -14550,8 +15046,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14565,8 +15061,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14580,8 +15076,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14597,7 +15093,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14607,9 +15120,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -14658,8 +15171,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14673,8 +15186,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14688,8 +15201,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14705,7 +15218,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14715,11 +15245,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -14784,8 +15314,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14799,8 +15329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14814,8 +15344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14831,7 +15361,24 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14841,9 +15388,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -14890,8 +15437,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14905,8 +15452,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14920,8 +15467,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14938,8 +15485,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -14953,8 +15500,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -14968,9 +15530,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -15019,8 +15581,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15034,8 +15596,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15049,8 +15611,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15067,8 +15629,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -15082,8 +15644,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -15097,9 +15674,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000240-namer-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000240-namer-post-simplified.yaml
index f30c112..eb50c6d 100644
--- a/test/scenarios/datafactory/output/clicommon-000240-namer-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000240-namer-post-simplified.yaml
@@ -28,6 +28,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ConfigureFactoryRepo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -60,6 +65,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
                 cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: FactoryRepoUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -86,6 +96,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -128,6 +143,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
                 cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: Factory
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -165,6 +185,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
                 cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: FactoryUpdateParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -201,6 +226,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -232,6 +262,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetGitHubAccessToken
           cli:
             cliKey: GetGitHubAccessToken
@@ -269,6 +304,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
                 cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: GitHubAccessTokenRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: GetDataPlaneAccess
           cli:
             cliKey: GetDataPlaneAccess
@@ -306,6 +346,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
                 cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: UserAccessPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: Triggers
       cli:
         cliKey: Triggers
@@ -344,6 +389,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: QueryByFactory
           cli:
             cliKey: QueryByFactory
@@ -381,6 +431,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
                 cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: TriggerFilterParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -428,6 +483,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
                 cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: TriggerResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -469,6 +529,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -505,6 +570,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: SubscribeToEvents
           cli:
             cliKey: SubscribeToEvents
@@ -542,6 +612,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: GetEventSubscriptionStatus
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -578,6 +653,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: UnsubscribeFromEvents
           cli:
             cliKey: UnsubscribeFromEvents
@@ -615,6 +695,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -651,6 +736,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -687,6 +777,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: IntegrationRuntimes
       cli:
         cliKey: IntegrationRuntimes
@@ -725,6 +820,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -772,6 +872,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: IntegrationRuntimeResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -813,6 +918,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -855,6 +965,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: UpdateIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -891,6 +1006,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetStatus
           cli:
             cliKey: GetStatus
@@ -927,6 +1047,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: GetConnectionInfo
           cli:
             cliKey: GetConnectionInfo
@@ -963,6 +1088,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: RegenerateAuthKey
           cli:
             cliKey: RegenerateAuthKey
@@ -1005,6 +1135,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: IntegrationRuntimeRegenerateKeyParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: ListAuthKeys
           cli:
             cliKey: ListAuthKeys
@@ -1042,6 +1177,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -1078,6 +1218,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -1114,6 +1259,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: SyncCredentials
           cli:
             cliKey: SyncCredentials
@@ -1150,6 +1300,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: GetMonitoringData
           cli:
             cliKey: GetMonitoringData
@@ -1186,6 +1341,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: Upgrade
           cli:
             cliKey: Upgrade
@@ -1222,6 +1382,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: RemoveLinks
           cli:
             cliKey: RemoveLinks
@@ -1265,6 +1430,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: LinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: CreateLinkedIntegrationRuntime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1307,6 +1477,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: CreateLinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000240-namer-post.yaml b/test/scenarios/datafactory/output/clicommon-000240-namer-post.yaml
index a09417f..9cd0eb2 100644
--- a/test/scenarios/datafactory/output/clicommon-000240-namer-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000240-namer-post.yaml
@@ -661,7 +661,7 @@ schemas:
           name: FactoryRepoUpdateFactoryResourceId
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -676,7 +676,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -943,7 +943,7 @@ schemas:
           name: TriggerQueryResponseContinuationToken
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -3556,6 +3556,19 @@ schemas:
           name: ApiVersion20180601
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -3642,7 +3655,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ResourceTags
@@ -3656,7 +3668,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: FactoryUpdateParametersTags
@@ -3904,7 +3915,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeNodeCapabilities
@@ -3918,7 +3928,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeStatusTypePropertiesCapabilities
@@ -4162,7 +4171,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5065,7 +5074,7 @@ schemas:
           cliPath: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5118,7 +5127,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
           cliPath: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5171,7 +5180,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
           cliPath: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5240,7 +5249,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
           cliPath: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5373,7 +5382,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
           cliPath: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5439,7 +5448,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
           cliPath: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9390,7 +9399,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9443,7 +9452,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
           cliPath: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9512,7 +9521,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
           cliPath: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9567,7 +9576,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
           cliPath: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9638,7 +9647,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11041,7 +11050,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11157,7 +11166,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11197,7 +11206,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11250,7 +11259,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11461,7 +11470,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11502,7 +11511,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
           cliPath: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -12761,7 +12770,27 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12772,7 +12801,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -12977,7 +13006,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -12998,8 +13027,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -13016,8 +13045,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -13031,7 +13078,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -13121,8 +13168,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13141,7 +13188,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13151,9 +13218,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -13259,8 +13326,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13277,8 +13344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13296,7 +13363,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -13315,7 +13382,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -13333,8 +13400,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -13348,9 +13433,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -13422,8 +13507,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13440,8 +13525,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13461,8 +13546,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -13479,8 +13564,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -13494,8 +13597,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -13569,8 +13672,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13587,8 +13690,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13606,7 +13709,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -13624,7 +13727,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13634,9 +13757,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -13726,8 +13849,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13744,8 +13867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13764,7 +13887,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13774,8 +13917,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -13833,8 +13976,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13851,8 +13994,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13872,8 +14015,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -13890,8 +14033,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -13905,10 +14066,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -13971,8 +14132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13989,8 +14150,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14010,7 +14171,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -14028,8 +14189,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -14043,10 +14222,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -14131,8 +14310,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14149,8 +14328,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14169,7 +14348,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14179,10 +14378,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -14267,8 +14466,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14285,8 +14484,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14306,8 +14505,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -14324,8 +14523,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -14339,10 +14556,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -14415,8 +14632,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14433,8 +14650,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14451,8 +14668,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14470,7 +14687,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -14489,7 +14706,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -14507,8 +14724,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -14522,10 +14757,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -14682,8 +14917,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14700,8 +14935,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14718,8 +14953,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14737,7 +14972,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -14755,7 +14990,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14765,10 +15020,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -14860,8 +15115,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14878,8 +15133,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14896,8 +15151,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14916,7 +15171,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14926,9 +15201,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -14987,8 +15262,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15005,8 +15280,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15023,8 +15298,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15043,7 +15318,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15053,11 +15348,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15125,8 +15420,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15143,8 +15438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15161,8 +15456,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15181,7 +15476,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15191,11 +15506,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15250,8 +15565,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15268,8 +15583,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15286,8 +15601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15306,7 +15621,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15316,11 +15651,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15388,8 +15723,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15406,8 +15741,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15424,8 +15759,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15444,7 +15779,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15454,9 +15809,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -15507,8 +15862,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15525,8 +15880,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15543,8 +15898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15563,7 +15918,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15573,9 +15948,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -15639,8 +16014,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15657,8 +16032,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15677,7 +16052,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15687,10 +16082,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -15761,8 +16156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15779,8 +16174,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15797,8 +16192,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15816,7 +16211,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -15835,7 +16230,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -15853,8 +16248,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -15868,10 +16281,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -15944,8 +16357,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15962,8 +16375,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15980,8 +16393,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15999,7 +16412,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -16017,7 +16430,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16027,10 +16460,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -16108,8 +16541,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16126,8 +16559,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16144,8 +16577,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16165,8 +16598,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -16183,8 +16616,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -16198,9 +16649,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -16271,8 +16722,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16289,8 +16740,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16307,8 +16758,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16327,7 +16778,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16337,9 +16808,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -16398,8 +16869,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16416,8 +16887,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16434,8 +16905,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16454,7 +16925,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16464,9 +16955,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -16568,8 +17059,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16586,8 +17077,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16604,8 +17095,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16624,7 +17115,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16634,11 +17145,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -16703,8 +17214,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16721,8 +17232,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16739,8 +17250,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16760,8 +17271,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -16778,8 +17289,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -16793,11 +17322,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16859,8 +17388,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16877,8 +17406,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16895,8 +17424,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16915,7 +17444,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16925,11 +17474,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16990,8 +17539,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17008,8 +17557,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17026,8 +17575,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17046,7 +17595,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17056,9 +17625,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -17138,8 +17707,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17156,8 +17725,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17174,8 +17743,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17194,7 +17763,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17204,9 +17793,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -17266,8 +17855,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17284,8 +17873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17302,8 +17891,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17322,7 +17911,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17332,9 +17941,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -17388,8 +17997,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17406,8 +18015,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17424,8 +18033,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17444,7 +18053,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17454,11 +18083,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -17526,8 +18155,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17544,8 +18173,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17562,8 +18191,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17582,7 +18211,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17592,9 +18241,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -17644,8 +18293,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17662,8 +18311,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17680,8 +18329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17701,8 +18350,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -17719,8 +18368,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -17734,9 +18401,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -17788,8 +18455,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17806,8 +18473,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17824,8 +18491,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17845,8 +18512,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -17863,8 +18530,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -17878,9 +18563,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000250-test-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000250-test-pre-simplified.yaml
index 6b96970..5c88527 100644
--- a/test/scenarios/datafactory/output/clicommon-000250-test-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000250-test-pre-simplified.yaml
@@ -28,6 +28,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ConfigureFactoryRepo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -60,6 +65,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
                 cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: FactoryRepoUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -86,6 +96,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -128,6 +143,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
                 cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: Factory
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -165,6 +185,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
                 cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: FactoryUpdateParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -201,6 +226,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -232,6 +262,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetGitHubAccessToken
           cli:
             cliKey: GetGitHubAccessToken
@@ -269,6 +304,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
                 cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: GitHubAccessTokenRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: GetDataPlaneAccess
           cli:
             cliKey: GetDataPlaneAccess
@@ -306,6 +346,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
                 cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: UserAccessPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: Triggers
       cli:
         name: Trigger
@@ -344,6 +389,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: QueryByFactory
           cli:
             cliKey: QueryByFactory
@@ -381,6 +431,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
                 cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: TriggerFilterParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -428,6 +483,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
                 cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: TriggerResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -469,6 +529,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -505,6 +570,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: SubscribeToEvents
           cli:
             name: SubscribeToEvent
@@ -542,6 +612,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: GetEventSubscriptionStatus
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -578,6 +653,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: UnsubscribeFromEvents
           cli:
             name: UnsubscribeFromEvent
@@ -615,6 +695,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -651,6 +736,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -687,6 +777,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: IntegrationRuntimes
       cli:
         name: IntegrationRuntime
@@ -725,6 +820,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -772,6 +872,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: IntegrationRuntimeResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -813,6 +918,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -855,6 +965,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: UpdateIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -891,6 +1006,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetStatus
           cli:
             cliKey: GetStatus
@@ -927,6 +1047,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: GetConnectionInfo
           cli:
             cliKey: GetConnectionInfo
@@ -963,6 +1088,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: RegenerateAuthKey
           cli:
             cliKey: RegenerateAuthKey
@@ -1005,6 +1135,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: IntegrationRuntimeRegenerateKeyParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: ListAuthKeys
           cli:
             name: ListAuthKey
@@ -1042,6 +1177,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -1078,6 +1218,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -1114,6 +1259,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: SyncCredentials
           cli:
             cliKey: SyncCredentials
@@ -1150,6 +1300,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: GetMonitoringData
           cli:
             cliKey: GetMonitoringData
@@ -1186,6 +1341,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: Upgrade
           cli:
             cliKey: Upgrade
@@ -1222,6 +1382,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: RemoveLinks
           cli:
             name: RemoveLink
@@ -1265,6 +1430,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: LinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: CreateLinkedIntegrationRuntime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1307,6 +1477,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: CreateLinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000250-test-pre.yaml b/test/scenarios/datafactory/output/clicommon-000250-test-pre.yaml
index a09417f..9cd0eb2 100644
--- a/test/scenarios/datafactory/output/clicommon-000250-test-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000250-test-pre.yaml
@@ -661,7 +661,7 @@ schemas:
           name: FactoryRepoUpdateFactoryResourceId
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -676,7 +676,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -943,7 +943,7 @@ schemas:
           name: TriggerQueryResponseContinuationToken
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -3556,6 +3556,19 @@ schemas:
           name: ApiVersion20180601
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -3642,7 +3655,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ResourceTags
@@ -3656,7 +3668,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: FactoryUpdateParametersTags
@@ -3904,7 +3915,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeNodeCapabilities
@@ -3918,7 +3928,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeStatusTypePropertiesCapabilities
@@ -4162,7 +4171,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5065,7 +5074,7 @@ schemas:
           cliPath: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5118,7 +5127,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
           cliPath: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5171,7 +5180,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
           cliPath: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5240,7 +5249,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
           cliPath: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5373,7 +5382,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
           cliPath: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5439,7 +5448,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
           cliPath: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9390,7 +9399,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9443,7 +9452,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
           cliPath: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9512,7 +9521,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
           cliPath: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9567,7 +9576,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
           cliPath: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9638,7 +9647,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11041,7 +11050,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11157,7 +11166,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11197,7 +11206,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11250,7 +11259,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11461,7 +11470,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11502,7 +11511,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
           cliPath: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -12761,7 +12770,27 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12772,7 +12801,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -12977,7 +13006,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -12998,8 +13027,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -13016,8 +13045,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -13031,7 +13078,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -13121,8 +13168,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13141,7 +13188,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13151,9 +13218,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -13259,8 +13326,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13277,8 +13344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13296,7 +13363,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -13315,7 +13382,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -13333,8 +13400,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -13348,9 +13433,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -13422,8 +13507,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13440,8 +13525,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13461,8 +13546,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -13479,8 +13564,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -13494,8 +13597,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -13569,8 +13672,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13587,8 +13690,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13606,7 +13709,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -13624,7 +13727,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13634,9 +13757,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -13726,8 +13849,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13744,8 +13867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13764,7 +13887,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13774,8 +13917,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -13833,8 +13976,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13851,8 +13994,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13872,8 +14015,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -13890,8 +14033,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -13905,10 +14066,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -13971,8 +14132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13989,8 +14150,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14010,7 +14171,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -14028,8 +14189,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -14043,10 +14222,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -14131,8 +14310,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14149,8 +14328,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14169,7 +14348,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14179,10 +14378,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -14267,8 +14466,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14285,8 +14484,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14306,8 +14505,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -14324,8 +14523,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -14339,10 +14556,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -14415,8 +14632,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14433,8 +14650,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14451,8 +14668,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14470,7 +14687,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -14489,7 +14706,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -14507,8 +14724,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -14522,10 +14757,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -14682,8 +14917,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14700,8 +14935,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14718,8 +14953,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14737,7 +14972,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -14755,7 +14990,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14765,10 +15020,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -14860,8 +15115,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14878,8 +15133,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14896,8 +15151,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14916,7 +15171,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14926,9 +15201,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -14987,8 +15262,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15005,8 +15280,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15023,8 +15298,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15043,7 +15318,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15053,11 +15348,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15125,8 +15420,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15143,8 +15438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15161,8 +15456,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15181,7 +15476,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15191,11 +15506,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15250,8 +15565,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15268,8 +15583,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15286,8 +15601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15306,7 +15621,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15316,11 +15651,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15388,8 +15723,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15406,8 +15741,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15424,8 +15759,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15444,7 +15779,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15454,9 +15809,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -15507,8 +15862,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15525,8 +15880,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15543,8 +15898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15563,7 +15918,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15573,9 +15948,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -15639,8 +16014,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15657,8 +16032,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15677,7 +16052,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15687,10 +16082,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -15761,8 +16156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15779,8 +16174,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15797,8 +16192,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15816,7 +16211,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -15835,7 +16230,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -15853,8 +16248,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -15868,10 +16281,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -15944,8 +16357,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15962,8 +16375,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15980,8 +16393,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15999,7 +16412,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -16017,7 +16430,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16027,10 +16460,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -16108,8 +16541,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16126,8 +16559,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16144,8 +16577,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16165,8 +16598,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -16183,8 +16616,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -16198,9 +16649,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -16271,8 +16722,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16289,8 +16740,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16307,8 +16758,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16327,7 +16778,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16337,9 +16808,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -16398,8 +16869,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16416,8 +16887,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16434,8 +16905,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16454,7 +16925,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16464,9 +16955,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -16568,8 +17059,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16586,8 +17077,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16604,8 +17095,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16624,7 +17115,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16634,11 +17145,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -16703,8 +17214,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16721,8 +17232,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16739,8 +17250,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16760,8 +17271,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -16778,8 +17289,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -16793,11 +17322,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16859,8 +17388,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16877,8 +17406,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16895,8 +17424,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16915,7 +17444,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16925,11 +17474,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16990,8 +17539,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17008,8 +17557,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17026,8 +17575,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17046,7 +17595,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17056,9 +17625,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -17138,8 +17707,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17156,8 +17725,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17174,8 +17743,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17194,7 +17763,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17204,9 +17793,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -17266,8 +17855,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17284,8 +17873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17302,8 +17891,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17322,7 +17911,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17332,9 +17941,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -17388,8 +17997,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17406,8 +18015,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17424,8 +18033,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17444,7 +18053,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17454,11 +18083,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -17526,8 +18155,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17544,8 +18173,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17562,8 +18191,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17582,7 +18211,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17592,9 +18241,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -17644,8 +18293,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17662,8 +18311,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17680,8 +18329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17701,8 +18350,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -17719,8 +18368,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -17734,9 +18401,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -17788,8 +18455,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17806,8 +18473,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17824,8 +18491,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17845,8 +18512,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -17863,8 +18530,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -17878,9 +18563,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000260-test-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000260-test-post-simplified.yaml
index 6b96970..5c88527 100644
--- a/test/scenarios/datafactory/output/clicommon-000260-test-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000260-test-post-simplified.yaml
@@ -28,6 +28,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ConfigureFactoryRepo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -60,6 +65,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
                 cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: FactoryRepoUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -86,6 +96,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -128,6 +143,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
                 cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: Factory
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -165,6 +185,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
                 cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: FactoryUpdateParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -201,6 +226,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -232,6 +262,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetGitHubAccessToken
           cli:
             cliKey: GetGitHubAccessToken
@@ -269,6 +304,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
                 cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: GitHubAccessTokenRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: GetDataPlaneAccess
           cli:
             cliKey: GetDataPlaneAccess
@@ -306,6 +346,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
                 cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: UserAccessPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: Triggers
       cli:
         name: Trigger
@@ -344,6 +389,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: QueryByFactory
           cli:
             cliKey: QueryByFactory
@@ -381,6 +431,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
                 cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: TriggerFilterParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -428,6 +483,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
                 cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: TriggerResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -469,6 +529,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -505,6 +570,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: SubscribeToEvents
           cli:
             name: SubscribeToEvent
@@ -542,6 +612,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: GetEventSubscriptionStatus
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -578,6 +653,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: UnsubscribeFromEvents
           cli:
             name: UnsubscribeFromEvent
@@ -615,6 +695,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -651,6 +736,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -687,6 +777,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: IntegrationRuntimes
       cli:
         name: IntegrationRuntime
@@ -725,6 +820,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -772,6 +872,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: IntegrationRuntimeResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -813,6 +918,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -855,6 +965,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: UpdateIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -891,6 +1006,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetStatus
           cli:
             cliKey: GetStatus
@@ -927,6 +1047,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: GetConnectionInfo
           cli:
             cliKey: GetConnectionInfo
@@ -963,6 +1088,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: RegenerateAuthKey
           cli:
             cliKey: RegenerateAuthKey
@@ -1005,6 +1135,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: IntegrationRuntimeRegenerateKeyParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: ListAuthKeys
           cli:
             name: ListAuthKey
@@ -1042,6 +1177,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -1078,6 +1218,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -1114,6 +1259,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: SyncCredentials
           cli:
             cliKey: SyncCredentials
@@ -1150,6 +1300,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: GetMonitoringData
           cli:
             cliKey: GetMonitoringData
@@ -1186,6 +1341,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: Upgrade
           cli:
             cliKey: Upgrade
@@ -1222,6 +1382,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: RemoveLinks
           cli:
             name: RemoveLink
@@ -1265,6 +1430,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: LinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: CreateLinkedIntegrationRuntime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1307,6 +1477,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: CreateLinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000260-test-post.yaml b/test/scenarios/datafactory/output/clicommon-000260-test-post.yaml
index 3801bae..8cc4d58 100644
--- a/test/scenarios/datafactory/output/clicommon-000260-test-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000260-test-post.yaml
@@ -661,7 +661,7 @@ schemas:
           name: FactoryRepoUpdateFactoryResourceId
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -676,7 +676,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -943,7 +943,7 @@ schemas:
           name: TriggerQueryResponseContinuationToken
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -3556,6 +3556,19 @@ schemas:
           name: ApiVersion20180601
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -3642,7 +3655,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ResourceTags
@@ -3656,7 +3668,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: FactoryUpdateParametersTags
@@ -3904,7 +3915,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeNodeCapabilities
@@ -3918,7 +3928,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeStatusTypePropertiesCapabilities
@@ -4162,7 +4171,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5065,7 +5074,7 @@ schemas:
           cliPath: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5118,7 +5127,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
           cliPath: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5171,7 +5180,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
           cliPath: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5240,7 +5249,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
           cliPath: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5373,7 +5382,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
           cliPath: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5439,7 +5448,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
           cliPath: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9390,7 +9399,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9443,7 +9452,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
           cliPath: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9512,7 +9521,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
           cliPath: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9567,7 +9576,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
           cliPath: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9638,7 +9647,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11041,7 +11050,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11157,7 +11166,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11197,7 +11206,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11250,7 +11259,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11461,7 +11470,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11502,7 +11511,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
           cliPath: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -12761,7 +12770,27 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12772,7 +12801,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -12977,7 +13006,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -12998,8 +13027,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -13016,8 +13045,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -13031,7 +13078,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -13121,8 +13168,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13141,7 +13188,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13151,9 +13218,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -13259,8 +13326,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13277,8 +13344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13296,7 +13363,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -13315,7 +13382,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -13333,8 +13400,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -13348,9 +13433,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -13422,8 +13507,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13440,8 +13525,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13461,8 +13546,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -13479,8 +13564,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -13494,8 +13597,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -13569,8 +13672,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13587,8 +13690,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13606,7 +13709,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -13624,7 +13727,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13634,9 +13757,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -13726,8 +13849,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13744,8 +13867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13764,7 +13887,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13774,8 +13917,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -13833,8 +13976,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13851,8 +13994,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13872,8 +14015,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -13890,8 +14033,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -13905,10 +14066,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -13971,8 +14132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13989,8 +14150,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14010,7 +14171,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -14028,8 +14189,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -14043,10 +14222,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -14131,8 +14310,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14149,8 +14328,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14169,7 +14348,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14179,10 +14378,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -14267,8 +14466,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14285,8 +14484,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14306,8 +14505,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -14324,8 +14523,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -14339,10 +14556,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -14415,8 +14632,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14433,8 +14650,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14451,8 +14668,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14470,7 +14687,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -14489,7 +14706,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -14507,8 +14724,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -14522,10 +14757,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -14682,8 +14917,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14700,8 +14935,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14718,8 +14953,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14737,7 +14972,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -14755,7 +14990,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14765,10 +15020,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -14860,8 +15115,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14878,8 +15133,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14896,8 +15151,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14916,7 +15171,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14926,9 +15201,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -14987,8 +15262,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15005,8 +15280,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15023,8 +15298,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15043,7 +15318,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15053,11 +15348,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15125,8 +15420,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15143,8 +15438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15161,8 +15456,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15181,7 +15476,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15191,11 +15506,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15250,8 +15565,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15268,8 +15583,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15286,8 +15601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15306,7 +15621,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15316,11 +15651,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15388,8 +15723,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15406,8 +15741,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15424,8 +15759,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15444,7 +15779,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15454,9 +15809,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -15507,8 +15862,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15525,8 +15880,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15543,8 +15898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15563,7 +15918,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15573,9 +15948,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -15639,8 +16014,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15657,8 +16032,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15677,7 +16052,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15687,10 +16082,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -15761,8 +16156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15779,8 +16174,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15797,8 +16192,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15816,7 +16211,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -15835,7 +16230,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -15853,8 +16248,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -15868,10 +16281,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -15944,8 +16357,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15962,8 +16375,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15980,8 +16393,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15999,7 +16412,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -16017,7 +16430,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16027,10 +16460,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -16108,8 +16541,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16126,8 +16559,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16144,8 +16577,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16165,8 +16598,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -16183,8 +16616,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -16198,9 +16649,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -16271,8 +16722,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16289,8 +16740,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16307,8 +16758,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16327,7 +16778,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16337,9 +16808,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -16398,8 +16869,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16416,8 +16887,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16434,8 +16905,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16454,7 +16925,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16464,9 +16955,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -16568,8 +17059,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16586,8 +17077,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16604,8 +17095,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16624,7 +17115,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16634,11 +17145,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -16703,8 +17214,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16721,8 +17232,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16739,8 +17250,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16760,8 +17271,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -16778,8 +17289,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -16793,11 +17322,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16859,8 +17388,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16877,8 +17406,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16895,8 +17424,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16915,7 +17444,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16925,11 +17474,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16990,8 +17539,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17008,8 +17557,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17026,8 +17575,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17046,7 +17595,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17056,9 +17625,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -17138,8 +17707,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17156,8 +17725,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17174,8 +17743,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17194,7 +17763,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17204,9 +17793,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -17266,8 +17855,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17284,8 +17873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17302,8 +17891,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17322,7 +17911,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17332,9 +17941,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -17388,8 +17997,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17406,8 +18015,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17424,8 +18033,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17444,7 +18053,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17454,11 +18083,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -17526,8 +18155,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17544,8 +18173,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17562,8 +18191,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17582,7 +18211,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17592,9 +18241,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -17644,8 +18293,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17662,8 +18311,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17680,8 +18329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17701,8 +18350,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -17719,8 +18368,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -17734,9 +18401,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -17788,8 +18455,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17806,8 +18473,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17824,8 +18491,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17845,8 +18512,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -17863,8 +18530,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -17878,9 +18563,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000270-complex-marker-pre-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000270-complex-marker-pre-simplified.yaml
index 6b96970..5c88527 100644
--- a/test/scenarios/datafactory/output/clicommon-000270-complex-marker-pre-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000270-complex-marker-pre-simplified.yaml
@@ -28,6 +28,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ConfigureFactoryRepo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -60,6 +65,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
                 cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: FactoryRepoUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -86,6 +96,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -128,6 +143,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
                 cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: Factory
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -165,6 +185,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
                 cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: FactoryUpdateParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -201,6 +226,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -232,6 +262,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetGitHubAccessToken
           cli:
             cliKey: GetGitHubAccessToken
@@ -269,6 +304,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
                 cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: GitHubAccessTokenRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: GetDataPlaneAccess
           cli:
             cliKey: GetDataPlaneAccess
@@ -306,6 +346,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
                 cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: UserAccessPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: Triggers
       cli:
         name: Trigger
@@ -344,6 +389,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: QueryByFactory
           cli:
             cliKey: QueryByFactory
@@ -381,6 +431,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
                 cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: TriggerFilterParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -428,6 +483,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
                 cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: TriggerResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -469,6 +529,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -505,6 +570,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: SubscribeToEvents
           cli:
             name: SubscribeToEvent
@@ -542,6 +612,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: GetEventSubscriptionStatus
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -578,6 +653,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: UnsubscribeFromEvents
           cli:
             name: UnsubscribeFromEvent
@@ -615,6 +695,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -651,6 +736,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -687,6 +777,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: IntegrationRuntimes
       cli:
         name: IntegrationRuntime
@@ -725,6 +820,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -772,6 +872,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: IntegrationRuntimeResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -813,6 +918,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -855,6 +965,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: UpdateIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -891,6 +1006,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetStatus
           cli:
             cliKey: GetStatus
@@ -927,6 +1047,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: GetConnectionInfo
           cli:
             cliKey: GetConnectionInfo
@@ -963,6 +1088,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: RegenerateAuthKey
           cli:
             cliKey: RegenerateAuthKey
@@ -1005,6 +1135,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: IntegrationRuntimeRegenerateKeyParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: ListAuthKeys
           cli:
             name: ListAuthKey
@@ -1042,6 +1177,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -1078,6 +1218,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -1114,6 +1259,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: SyncCredentials
           cli:
             cliKey: SyncCredentials
@@ -1150,6 +1300,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: GetMonitoringData
           cli:
             cliKey: GetMonitoringData
@@ -1186,6 +1341,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: Upgrade
           cli:
             cliKey: Upgrade
@@ -1222,6 +1382,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: RemoveLinks
           cli:
             name: RemoveLink
@@ -1265,6 +1430,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: LinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: CreateLinkedIntegrationRuntime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1307,6 +1477,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: CreateLinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000270-complex-marker-pre.yaml b/test/scenarios/datafactory/output/clicommon-000270-complex-marker-pre.yaml
index 3801bae..8cc4d58 100644
--- a/test/scenarios/datafactory/output/clicommon-000270-complex-marker-pre.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000270-complex-marker-pre.yaml
@@ -661,7 +661,7 @@ schemas:
           name: FactoryRepoUpdateFactoryResourceId
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -676,7 +676,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -943,7 +943,7 @@ schemas:
           name: TriggerQueryResponseContinuationToken
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -3556,6 +3556,19 @@ schemas:
           name: ApiVersion20180601
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -3642,7 +3655,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ResourceTags
@@ -3656,7 +3668,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: FactoryUpdateParametersTags
@@ -3904,7 +3915,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeNodeCapabilities
@@ -3918,7 +3928,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeStatusTypePropertiesCapabilities
@@ -4162,7 +4171,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5065,7 +5074,7 @@ schemas:
           cliPath: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5118,7 +5127,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
           cliPath: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5171,7 +5180,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
           cliPath: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5240,7 +5249,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
           cliPath: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5373,7 +5382,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
           cliPath: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5439,7 +5448,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
           cliPath: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9390,7 +9399,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9443,7 +9452,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
           cliPath: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9512,7 +9521,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
           cliPath: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9567,7 +9576,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
           cliPath: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9638,7 +9647,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11041,7 +11050,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11157,7 +11166,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11197,7 +11206,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11250,7 +11259,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11461,7 +11470,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11502,7 +11511,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
           cliPath: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -12761,7 +12770,27 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12772,7 +12801,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -12977,7 +13006,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -12998,8 +13027,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -13016,8 +13045,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -13031,7 +13078,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -13121,8 +13168,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13141,7 +13188,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13151,9 +13218,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -13259,8 +13326,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13277,8 +13344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13296,7 +13363,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -13315,7 +13382,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -13333,8 +13400,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -13348,9 +13433,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -13422,8 +13507,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13440,8 +13525,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13461,8 +13546,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -13479,8 +13564,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -13494,8 +13597,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -13569,8 +13672,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13587,8 +13690,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13606,7 +13709,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -13624,7 +13727,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13634,9 +13757,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -13726,8 +13849,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13744,8 +13867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13764,7 +13887,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13774,8 +13917,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -13833,8 +13976,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13851,8 +13994,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13872,8 +14015,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -13890,8 +14033,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -13905,10 +14066,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -13971,8 +14132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13989,8 +14150,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14010,7 +14171,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -14028,8 +14189,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -14043,10 +14222,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -14131,8 +14310,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14149,8 +14328,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14169,7 +14348,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14179,10 +14378,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -14267,8 +14466,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14285,8 +14484,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14306,8 +14505,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -14324,8 +14523,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -14339,10 +14556,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -14415,8 +14632,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14433,8 +14650,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14451,8 +14668,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14470,7 +14687,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -14489,7 +14706,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -14507,8 +14724,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -14522,10 +14757,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -14682,8 +14917,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14700,8 +14935,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14718,8 +14953,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14737,7 +14972,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -14755,7 +14990,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14765,10 +15020,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -14860,8 +15115,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14878,8 +15133,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14896,8 +15151,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14916,7 +15171,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14926,9 +15201,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -14987,8 +15262,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15005,8 +15280,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15023,8 +15298,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15043,7 +15318,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15053,11 +15348,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15125,8 +15420,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15143,8 +15438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15161,8 +15456,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15181,7 +15476,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15191,11 +15506,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15250,8 +15565,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15268,8 +15583,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15286,8 +15601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15306,7 +15621,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15316,11 +15651,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15388,8 +15723,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15406,8 +15741,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15424,8 +15759,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15444,7 +15779,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15454,9 +15809,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -15507,8 +15862,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15525,8 +15880,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15543,8 +15898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15563,7 +15918,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15573,9 +15948,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -15639,8 +16014,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15657,8 +16032,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15677,7 +16052,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15687,10 +16082,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -15761,8 +16156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15779,8 +16174,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15797,8 +16192,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15816,7 +16211,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -15835,7 +16230,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -15853,8 +16248,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -15868,10 +16281,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -15944,8 +16357,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15962,8 +16375,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15980,8 +16393,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15999,7 +16412,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -16017,7 +16430,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16027,10 +16460,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -16108,8 +16541,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16126,8 +16559,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16144,8 +16577,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16165,8 +16598,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -16183,8 +16616,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -16198,9 +16649,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -16271,8 +16722,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16289,8 +16740,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16307,8 +16758,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16327,7 +16778,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16337,9 +16808,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -16398,8 +16869,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16416,8 +16887,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16434,8 +16905,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16454,7 +16925,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16464,9 +16955,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -16568,8 +17059,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16586,8 +17077,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16604,8 +17095,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16624,7 +17115,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16634,11 +17145,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -16703,8 +17214,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16721,8 +17232,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16739,8 +17250,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16760,8 +17271,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -16778,8 +17289,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -16793,11 +17322,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16859,8 +17388,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16877,8 +17406,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16895,8 +17424,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16915,7 +17444,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16925,11 +17474,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16990,8 +17539,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17008,8 +17557,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17026,8 +17575,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17046,7 +17595,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17056,9 +17625,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -17138,8 +17707,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17156,8 +17725,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17174,8 +17743,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17194,7 +17763,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17204,9 +17793,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -17266,8 +17855,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17284,8 +17873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17302,8 +17891,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17322,7 +17911,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17332,9 +17941,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -17388,8 +17997,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17406,8 +18015,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17424,8 +18033,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17444,7 +18053,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17454,11 +18083,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -17526,8 +18155,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17544,8 +18173,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17562,8 +18191,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17582,7 +18211,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17592,9 +18241,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -17644,8 +18293,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17662,8 +18311,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17680,8 +18329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17701,8 +18350,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -17719,8 +18368,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -17734,9 +18401,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -17788,8 +18455,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17806,8 +18473,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17824,8 +18491,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17845,8 +18512,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -17863,8 +18530,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -17878,9 +18563,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/datafactory/output/clicommon-000280-complex-marker-post-simplified.yaml b/test/scenarios/datafactory/output/clicommon-000280-complex-marker-post-simplified.yaml
index dafafa2..0069b1c 100644
--- a/test/scenarios/datafactory/output/clicommon-000280-complex-marker-post-simplified.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000280-complex-marker-post-simplified.yaml
@@ -28,6 +28,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['List']$$requests[0]$$parameters['accept']
         - operationName: ConfigureFactoryRepo
           cli:
             cliKey: ConfigureFactoryRepo
@@ -60,6 +65,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
                 cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['factoryRepoUpdate']
               bodySchema: FactoryRepoUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ConfigureFactoryRepo']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -86,6 +96,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -128,6 +143,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
                 cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['factory']
               bodySchema: Factory
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -165,6 +185,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
                 cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['factoryUpdateParameters']
               bodySchema: FactoryUpdateParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -201,6 +226,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Factories']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -232,6 +262,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetGitHubAccessToken
           cli:
             cliKey: GetGitHubAccessToken
@@ -269,6 +304,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
                 cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['gitHubAccessTokenRequest']
               bodySchema: GitHubAccessTokenRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetGitHubAccessToken']$$requests[0]$$parameters['accept']
         - operationName: GetDataPlaneAccess
           cli:
             cliKey: GetDataPlaneAccess
@@ -306,6 +346,11 @@ operationGroups:
                 cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
                 cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['policy']
               bodySchema: UserAccessPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Factories']$$operations['GetDataPlaneAccess']$$requests[0]$$parameters['accept']
     - operationGroupName: Triggers
       cli:
         name: Trigger
@@ -344,6 +389,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: QueryByFactory
           cli:
             cliKey: QueryByFactory
@@ -381,6 +431,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
                 cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['filterParameters']
               bodySchema: TriggerFilterParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['QueryByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -428,6 +483,11 @@ operationGroups:
                 cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
                 cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['trigger']
               bodySchema: TriggerResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -469,6 +529,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['Triggers']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -505,6 +570,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: SubscribeToEvents
           cli:
             name: SubscribeToEvent
@@ -542,6 +612,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['SubscribeToEvents']$$requests[0]$$parameters['accept']
         - operationName: GetEventSubscriptionStatus
           cli:
             cliKey: GetEventSubscriptionStatus
@@ -578,6 +653,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['GetEventSubscriptionStatus']$$requests[0]$$parameters['accept']
         - operationName: UnsubscribeFromEvents
           cli:
             name: UnsubscribeFromEvent
@@ -615,6 +695,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['UnsubscribeFromEvents']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -651,6 +736,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -687,6 +777,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Triggers']$$operations['Stop']$$requests[0]$$parameters['accept']
     - operationGroupName: IntegrationRuntimes
       cli:
         name: IntegrationRuntime
@@ -725,6 +820,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListByFactory']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -772,6 +872,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['integrationRuntime']
               bodySchema: IntegrationRuntimeResource
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Get
           cli:
             cliKey: Get
@@ -813,6 +918,11 @@ operationGroups:
                 cliKey: If-None-Match
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$parameters['If-None-Match']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -855,6 +965,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['updateIntegrationRuntimeRequest']
               bodySchema: UpdateIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -891,6 +1006,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: GetStatus
           cli:
             cliKey: GetStatus
@@ -927,6 +1047,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetStatus']$$requests[0]$$parameters['accept']
         - operationName: GetConnectionInfo
           cli:
             cliKey: GetConnectionInfo
@@ -963,6 +1088,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetConnectionInfo']$$requests[0]$$parameters['accept']
         - operationName: RegenerateAuthKey
           cli:
             cliKey: RegenerateAuthKey
@@ -1005,6 +1135,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['regenerateKeyParameters']
               bodySchema: IntegrationRuntimeRegenerateKeyParameters
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RegenerateAuthKey']$$requests[0]$$parameters['accept']
         - operationName: ListAuthKeys
           cli:
             name: ListAuthKey
@@ -1042,6 +1177,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['ListAuthKeys']$$requests[0]$$parameters['accept']
         - operationName: Start
           cli:
             cliKey: Start
@@ -1078,6 +1218,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Start']$$requests[0]$$parameters['accept']
         - operationName: Stop
           cli:
             cliKey: Stop
@@ -1114,6 +1259,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Stop']$$requests[0]$$parameters['accept']
         - operationName: SyncCredentials
           cli:
             cliKey: SyncCredentials
@@ -1150,6 +1300,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['SyncCredentials']$$requests[0]$$parameters['accept']
         - operationName: GetMonitoringData
           cli:
             cliKey: GetMonitoringData
@@ -1186,6 +1341,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['GetMonitoringData']$$requests[0]$$parameters['accept']
         - operationName: Upgrade
           cli:
             cliKey: Upgrade
@@ -1222,6 +1382,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['Upgrade']$$requests[0]$$parameters['accept']
         - operationName: RemoveLinks
           cli:
             name: RemoveLink
@@ -1265,6 +1430,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['linkedIntegrationRuntimeRequest']
               bodySchema: LinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['RemoveLinks']$$requests[0]$$parameters['accept']
         - operationName: CreateLinkedIntegrationRuntime
           cli:
             cliKey: CreateLinkedIntegrationRuntime
@@ -1307,6 +1477,11 @@ operationGroups:
                 cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
                 cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['createLinkedIntegrationRuntimeRequest']
               bodySchema: CreateLinkedIntegrationRuntimeRequest
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['IntegrationRuntimes']$$operations['CreateLinkedIntegrationRuntime']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/datafactory/output/clicommon-000280-complex-marker-post.yaml b/test/scenarios/datafactory/output/clicommon-000280-complex-marker-post.yaml
index 3801bae..8cc4d58 100644
--- a/test/scenarios/datafactory/output/clicommon-000280-complex-marker-post.yaml
+++ b/test/scenarios/datafactory/output/clicommon-000280-complex-marker-post.yaml
@@ -661,7 +661,7 @@ schemas:
           name: FactoryRepoUpdateFactoryResourceId
           description: The factory resource id.
       protocol: {}
-    - &ref_396
+    - &ref_397
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -676,7 +676,7 @@ schemas:
           name: String
           description: ''
       protocol: {}
-    - &ref_398
+    - &ref_399
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -943,7 +943,7 @@ schemas:
           name: TriggerQueryResponseContinuationToken
           description: 'The continuation token for getting the next page of results, if any remaining results exist, null otherwise.'
       protocol: {}
-    - &ref_429
+    - &ref_430
       type: string
       apiVersions:
         - version: '2018-06-01'
@@ -3556,6 +3556,19 @@ schemas:
           name: ApiVersion20180601
           description: Api Version (2018-06-01)
       protocol: {}
+    - &ref_392
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
     - &ref_148
       type: constant
       apiVersions:
@@ -3642,7 +3655,6 @@ schemas:
     - &ref_8
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ResourceTags
@@ -3656,7 +3668,6 @@ schemas:
     - &ref_44
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: FactoryUpdateParametersTags
@@ -3904,7 +3915,6 @@ schemas:
     - &ref_219
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeNodeCapabilities
@@ -3918,7 +3928,6 @@ schemas:
     - &ref_236
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: SelfHostedIntegrationRuntimeStatusTypePropertiesCapabilities
@@ -4162,7 +4171,7 @@ schemas:
           description: The client tenant id of the identity.
       protocol: {}
   objects:
-    - &ref_392
+    - &ref_393
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5065,7 +5074,7 @@ schemas:
           cliPath: 'schemas$$objects[''CloudError'']'
       protocol: {}
     - *ref_42
-    - &ref_393
+    - &ref_394
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5118,7 +5127,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryRepoUpdate'']'
           cliPath: 'schemas$$objects[''FactoryRepoUpdate'']'
       protocol: {}
-    - &ref_403
+    - &ref_404
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5171,7 +5180,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''FactoryUpdateParameters'']'
           cliPath: 'schemas$$objects[''FactoryUpdateParameters'']'
       protocol: {}
-    - &ref_412
+    - &ref_413
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5240,7 +5249,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''GitHubAccessTokenRequest'']'
           cliPath: 'schemas$$objects[''GitHubAccessTokenRequest'']'
       protocol: {}
-    - &ref_416
+    - &ref_417
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5373,7 +5382,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''UserAccessPolicy'']'
           cliPath: 'schemas$$objects[''UserAccessPolicy'']'
       protocol: {}
-    - &ref_420
+    - &ref_421
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -5439,7 +5448,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''AccessPolicyResponse'']'
           cliPath: 'schemas$$objects[''AccessPolicyResponse'']'
       protocol: {}
-    - &ref_423
+    - &ref_424
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9390,7 +9399,7 @@ schemas:
     - *ref_57
     - *ref_120
     - *ref_58
-    - &ref_424
+    - &ref_425
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9443,7 +9452,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerFilterParameters'']'
           cliPath: 'schemas$$objects[''TriggerFilterParameters'']'
       protocol: {}
-    - &ref_428
+    - &ref_429
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9512,7 +9521,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerQueryResponse'']'
           cliPath: 'schemas$$objects[''TriggerQueryResponse'']'
       protocol: {}
-    - &ref_445
+    - &ref_446
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9567,7 +9576,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
           cliPath: 'schemas$$objects[''TriggerSubscriptionOperationStatus'']'
       protocol: {}
-    - &ref_460
+    - &ref_461
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -9638,7 +9647,7 @@ schemas:
       protocol: {}
     - *ref_114
     - *ref_59
-    - &ref_470
+    - &ref_471
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11041,7 +11050,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeStatusResponse'']'
       protocol: {}
     - *ref_191
-    - &ref_484
+    - &ref_485
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11157,7 +11166,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeConnectionInfo'']'
       protocol: {}
-    - &ref_485
+    - &ref_486
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11197,7 +11206,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeRegenerateKeyParameters'']'
       protocol: {}
-    - &ref_490
+    - &ref_491
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11250,7 +11259,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
           cliPath: 'schemas$$objects[''IntegrationRuntimeAuthKeys'']'
       protocol: {}
-    - &ref_506
+    - &ref_507
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11461,7 +11470,7 @@ schemas:
           cliPath: 'schemas$$objects[''IntegrationRuntimeMonitoringData'']'
       protocol: {}
     - *ref_269
-    - &ref_510
+    - &ref_511
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -11502,7 +11511,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
           cliPath: 'schemas$$objects[''LinkedIntegrationRuntimeRequest'']'
       protocol: {}
-    - &ref_515
+    - &ref_516
       type: object
       apiVersions:
         - version: '2018-06-01'
@@ -12761,7 +12770,27 @@ operationGroups:
           - *ref_390
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -12772,7 +12801,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -12977,7 +13006,7 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_395
+          - &ref_396
             schema: *ref_1
             implementation: Method
             required: true
@@ -12998,8 +13027,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_394
-                schema: *ref_393
+              - &ref_395
+                schema: *ref_394
                 implementation: Method
                 required: true
                 language:
@@ -13016,8 +13045,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ConfigureFactoryRepo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_394
+              - *ref_395
             language:
               default:
                 name: ''
@@ -13031,7 +13078,7 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_395
+          - *ref_396
         responses:
           - schema: *ref_3
             language:
@@ -13121,8 +13168,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_397
-            schema: *ref_396
+          - &ref_398
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13141,7 +13188,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13151,9 +13218,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_397
+          - *ref_398
         responses:
-          - schema: *ref_392
+          - schema: *ref_393
             language:
               default:
                 name: ''
@@ -13259,8 +13326,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_400
-            schema: *ref_396
+          - &ref_401
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13277,8 +13344,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_401
-            schema: *ref_398
+          - &ref_402
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13296,7 +13363,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_402
+          - &ref_403
             schema: *ref_1
             implementation: Method
             language:
@@ -13315,7 +13382,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_399
+              - &ref_400
                 schema: *ref_3
                 implementation: Method
                 required: true
@@ -13333,8 +13400,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_399
+              - *ref_400
             language:
               default:
                 name: ''
@@ -13348,9 +13433,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_400
           - *ref_401
           - *ref_402
+          - *ref_403
         responses:
           - schema: *ref_3
             language:
@@ -13422,8 +13507,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_405
-            schema: *ref_396
+          - &ref_406
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13440,8 +13525,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_406
-            schema: *ref_398
+          - &ref_407
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13461,8 +13546,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_404
-                schema: *ref_403
+              - &ref_405
+                schema: *ref_404
                 implementation: Method
                 required: true
                 language:
@@ -13479,8 +13564,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_404
+              - *ref_405
             language:
               default:
                 name: ''
@@ -13494,8 +13597,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_405
           - *ref_406
+          - *ref_407
         responses:
           - schema: *ref_3
             language:
@@ -13569,8 +13672,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_407
-            schema: *ref_396
+          - &ref_408
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13587,8 +13690,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_408
-            schema: *ref_398
+          - &ref_409
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13606,7 +13709,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_409
+          - &ref_410
             schema: *ref_1
             implementation: Method
             language:
@@ -13624,7 +13727,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13634,9 +13757,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_407
           - *ref_408
           - *ref_409
+          - *ref_410
         responses:
           - schema: *ref_3
             language:
@@ -13726,8 +13849,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_410
-            schema: *ref_396
+          - &ref_411
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13744,8 +13867,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_411
-            schema: *ref_398
+          - &ref_412
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13764,7 +13887,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -13774,8 +13917,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_410
           - *ref_411
+          - *ref_412
         responses:
           - language:
               default:
@@ -13833,8 +13976,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_414
-            schema: *ref_396
+          - &ref_415
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13851,8 +13994,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_415
-            schema: *ref_398
+          - &ref_416
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -13872,8 +14015,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_413
-                schema: *ref_412
+              - &ref_414
+                schema: *ref_413
                 implementation: Method
                 required: true
                 language:
@@ -13890,8 +14033,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetGitHubAccessToken'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_413
+              - *ref_414
             language:
               default:
                 name: ''
@@ -13905,10 +14066,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_414
           - *ref_415
+          - *ref_416
         responses:
-          - schema: *ref_416
+          - schema: *ref_417
             language:
               default:
                 name: ''
@@ -13971,8 +14132,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_418
-            schema: *ref_396
+          - &ref_419
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -13989,8 +14150,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_419
-            schema: *ref_398
+          - &ref_420
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14010,7 +14171,7 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_417
+              - &ref_418
                 schema: *ref_54
                 implementation: Method
                 required: true
@@ -14028,8 +14189,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Factories'']$$operations[''GetDataPlaneAccess'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_417
+              - *ref_418
             language:
               default:
                 name: ''
@@ -14043,10 +14222,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_418
           - *ref_419
+          - *ref_420
         responses:
-          - schema: *ref_420
+          - schema: *ref_421
             language:
               default:
                 name: ''
@@ -14131,8 +14310,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_421
-            schema: *ref_396
+          - &ref_422
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14149,8 +14328,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_422
-            schema: *ref_398
+          - &ref_423
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14169,7 +14348,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14179,10 +14378,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_421
           - *ref_422
+          - *ref_423
         responses:
-          - schema: *ref_423
+          - schema: *ref_424
             language:
               default:
                 name: ''
@@ -14267,8 +14466,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_426
-            schema: *ref_396
+          - &ref_427
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14285,8 +14484,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_427
-            schema: *ref_398
+          - &ref_428
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14306,8 +14505,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_425
-                schema: *ref_424
+              - &ref_426
+                schema: *ref_425
                 implementation: Method
                 required: true
                 language:
@@ -14324,8 +14523,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''QueryByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_425
+              - *ref_426
             language:
               default:
                 name: ''
@@ -14339,10 +14556,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_426
           - *ref_427
+          - *ref_428
         responses:
-          - schema: *ref_428
+          - schema: *ref_429
             language:
               default:
                 name: ''
@@ -14415,8 +14632,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_431
-            schema: *ref_396
+          - &ref_432
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14433,8 +14650,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_432
-            schema: *ref_398
+          - &ref_433
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14451,8 +14668,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_433
-            schema: *ref_429
+          - &ref_434
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14470,7 +14687,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_434
+          - &ref_435
             schema: *ref_1
             implementation: Method
             language:
@@ -14489,7 +14706,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_430
+              - &ref_431
                 schema: *ref_57
                 implementation: Method
                 required: true
@@ -14507,8 +14724,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_430
+              - *ref_431
             language:
               default:
                 name: ''
@@ -14522,10 +14757,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_431
           - *ref_432
           - *ref_433
           - *ref_434
+          - *ref_435
         responses:
           - schema: *ref_57
             language:
@@ -14682,8 +14917,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_435
-            schema: *ref_396
+          - &ref_436
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14700,8 +14935,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_436
-            schema: *ref_398
+          - &ref_437
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14718,8 +14953,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_437
-            schema: *ref_429
+          - &ref_438
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14737,7 +14972,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_438
+          - &ref_439
             schema: *ref_1
             implementation: Method
             language:
@@ -14755,7 +14990,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14765,10 +15020,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_435
           - *ref_436
           - *ref_437
           - *ref_438
+          - *ref_439
         responses:
           - schema: *ref_57
             language:
@@ -14860,8 +15115,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_439
-            schema: *ref_396
+          - &ref_440
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -14878,8 +15133,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_440
-            schema: *ref_398
+          - &ref_441
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -14896,8 +15151,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_441
-            schema: *ref_429
+          - &ref_442
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -14916,7 +15171,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -14926,9 +15201,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_439
           - *ref_440
           - *ref_441
+          - *ref_442
         responses:
           - language:
               default:
@@ -14987,8 +15262,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_442
-            schema: *ref_396
+          - &ref_443
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15005,8 +15280,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_443
-            schema: *ref_398
+          - &ref_444
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15023,8 +15298,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_444
-            schema: *ref_429
+          - &ref_445
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15043,7 +15318,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''SubscribeToEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15053,11 +15348,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_442
           - *ref_443
           - *ref_444
+          - *ref_445
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15125,8 +15420,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_446
-            schema: *ref_396
+          - &ref_447
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15143,8 +15438,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_447
-            schema: *ref_398
+          - &ref_448
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15161,8 +15456,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_448
-            schema: *ref_429
+          - &ref_449
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15181,7 +15476,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''GetEventSubscriptionStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15191,11 +15506,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_446
           - *ref_447
           - *ref_448
+          - *ref_449
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15250,8 +15565,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_449
-            schema: *ref_396
+          - &ref_450
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15268,8 +15583,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_450
-            schema: *ref_398
+          - &ref_451
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15286,8 +15601,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_451
-            schema: *ref_429
+          - &ref_452
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15306,7 +15621,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''UnsubscribeFromEvents'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15316,11 +15651,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_449
           - *ref_450
           - *ref_451
+          - *ref_452
         responses:
-          - schema: *ref_445
+          - schema: *ref_446
             language:
               default:
                 name: ''
@@ -15388,8 +15723,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_452
-            schema: *ref_396
+          - &ref_453
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15406,8 +15741,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_453
-            schema: *ref_398
+          - &ref_454
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15424,8 +15759,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_454
-            schema: *ref_429
+          - &ref_455
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15444,7 +15779,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15454,9 +15809,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_452
           - *ref_453
           - *ref_454
+          - *ref_455
         responses:
           - language:
               default:
@@ -15507,8 +15862,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_455
-            schema: *ref_396
+          - &ref_456
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15525,8 +15880,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_456
-            schema: *ref_398
+          - &ref_457
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15543,8 +15898,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_457
-            schema: *ref_429
+          - &ref_458
+            schema: *ref_430
             implementation: Method
             required: true
             language:
@@ -15563,7 +15918,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Triggers'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15573,9 +15948,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_455
           - *ref_456
           - *ref_457
+          - *ref_458
         responses:
           - language:
               default:
@@ -15639,8 +16014,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_458
-            schema: *ref_396
+          - &ref_459
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15657,8 +16032,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_459
-            schema: *ref_398
+          - &ref_460
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15677,7 +16052,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListByFactory'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -15687,10 +16082,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_458
           - *ref_459
+          - *ref_460
         responses:
-          - schema: *ref_460
+          - schema: *ref_461
             language:
               default:
                 name: ''
@@ -15761,8 +16156,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_462
-            schema: *ref_396
+          - &ref_463
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15779,8 +16174,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_463
-            schema: *ref_398
+          - &ref_464
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15797,8 +16192,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_464
-            schema: *ref_398
+          - &ref_465
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15816,7 +16211,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_465
+          - &ref_466
             schema: *ref_1
             implementation: Method
             language:
@@ -15835,7 +16230,7 @@ operationGroups:
                 in: header
         requests:
           - parameters:
-              - &ref_461
+              - &ref_462
                 schema: *ref_114
                 implementation: Method
                 required: true
@@ -15853,8 +16248,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_461
+              - *ref_462
             language:
               default:
                 name: ''
@@ -15868,10 +16281,10 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_462
           - *ref_463
           - *ref_464
           - *ref_465
+          - *ref_466
         responses:
           - schema: *ref_114
             language:
@@ -15944,8 +16357,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_466
-            schema: *ref_396
+          - &ref_467
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -15962,8 +16375,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_467
-            schema: *ref_398
+          - &ref_468
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15980,8 +16393,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_468
-            schema: *ref_398
+          - &ref_469
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -15999,7 +16412,7 @@ operationGroups:
               http:
                 in: path
           - *ref_391
-          - &ref_469
+          - &ref_470
             schema: *ref_1
             implementation: Method
             language:
@@ -16017,7 +16430,27 @@ operationGroups:
               http:
                 in: header
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16027,10 +16460,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_466
           - *ref_467
           - *ref_468
           - *ref_469
+          - *ref_470
         responses:
           - schema: *ref_114
             language:
@@ -16108,8 +16541,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_472
-            schema: *ref_396
+          - &ref_473
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16126,8 +16559,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_473
-            schema: *ref_398
+          - &ref_474
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16144,8 +16577,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_474
-            schema: *ref_398
+          - &ref_475
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16165,8 +16598,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_471
-                schema: *ref_470
+              - &ref_472
+                schema: *ref_471
                 implementation: Method
                 required: true
                 language:
@@ -16183,8 +16616,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_471
+              - *ref_472
             language:
               default:
                 name: ''
@@ -16198,9 +16649,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_472
           - *ref_473
           - *ref_474
+          - *ref_475
         responses:
           - schema: *ref_114
             language:
@@ -16271,8 +16722,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_475
-            schema: *ref_396
+          - &ref_476
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16289,8 +16740,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_476
-            schema: *ref_398
+          - &ref_477
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16307,8 +16758,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_477
-            schema: *ref_398
+          - &ref_478
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16327,7 +16778,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16337,9 +16808,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_475
           - *ref_476
           - *ref_477
+          - *ref_478
         responses:
           - language:
               default:
@@ -16398,8 +16869,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_478
-            schema: *ref_396
+          - &ref_479
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16416,8 +16887,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_479
-            schema: *ref_398
+          - &ref_480
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16434,8 +16905,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_480
-            schema: *ref_398
+          - &ref_481
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16454,7 +16925,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetStatus'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16464,9 +16955,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_478
           - *ref_479
           - *ref_480
+          - *ref_481
         responses:
           - schema: *ref_289
             language:
@@ -16568,8 +17059,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_481
-            schema: *ref_396
+          - &ref_482
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16586,8 +17077,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_482
-            schema: *ref_398
+          - &ref_483
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16604,8 +17095,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_483
-            schema: *ref_398
+          - &ref_484
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16624,7 +17115,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetConnectionInfo'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16634,11 +17145,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_481
           - *ref_482
           - *ref_483
+          - *ref_484
         responses:
-          - schema: *ref_484
+          - schema: *ref_485
             language:
               default:
                 name: ''
@@ -16703,8 +17214,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_487
-            schema: *ref_396
+          - &ref_488
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16721,8 +17232,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_488
-            schema: *ref_398
+          - &ref_489
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16739,8 +17250,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_489
-            schema: *ref_398
+          - &ref_490
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16760,8 +17271,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_486
-                schema: *ref_485
+              - &ref_487
+                schema: *ref_486
                 implementation: Method
                 required: true
                 language:
@@ -16778,8 +17289,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RegenerateAuthKey'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_486
+              - *ref_487
             language:
               default:
                 name: ''
@@ -16793,11 +17322,11 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_487
           - *ref_488
           - *ref_489
+          - *ref_490
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16859,8 +17388,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_491
-            schema: *ref_396
+          - &ref_492
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -16877,8 +17406,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_492
-            schema: *ref_398
+          - &ref_493
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16895,8 +17424,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_493
-            schema: *ref_398
+          - &ref_494
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -16915,7 +17444,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''ListAuthKeys'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -16925,11 +17474,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_491
           - *ref_492
           - *ref_493
+          - *ref_494
         responses:
-          - schema: *ref_490
+          - schema: *ref_491
             language:
               default:
                 name: ''
@@ -16990,8 +17539,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_494
-            schema: *ref_396
+          - &ref_495
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17008,8 +17557,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_495
-            schema: *ref_398
+          - &ref_496
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17026,8 +17575,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_496
-            schema: *ref_398
+          - &ref_497
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17046,7 +17595,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Start'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17056,9 +17625,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_494
           - *ref_495
           - *ref_496
+          - *ref_497
         responses:
           - schema: *ref_289
             language:
@@ -17138,8 +17707,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_497
-            schema: *ref_396
+          - &ref_498
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17156,8 +17725,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_498
-            schema: *ref_398
+          - &ref_499
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17174,8 +17743,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_499
-            schema: *ref_398
+          - &ref_500
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17194,7 +17763,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Stop'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17204,9 +17793,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_497
           - *ref_498
           - *ref_499
+          - *ref_500
         responses:
           - language:
               default:
@@ -17266,8 +17855,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_500
-            schema: *ref_396
+          - &ref_501
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17284,8 +17873,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_501
-            schema: *ref_398
+          - &ref_502
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17302,8 +17891,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_502
-            schema: *ref_398
+          - &ref_503
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17322,7 +17911,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''SyncCredentials'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17332,9 +17941,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_500
           - *ref_501
           - *ref_502
+          - *ref_503
         responses:
           - language:
               default:
@@ -17388,8 +17997,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_503
-            schema: *ref_396
+          - &ref_504
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17406,8 +18015,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_504
-            schema: *ref_398
+          - &ref_505
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17424,8 +18033,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_505
-            schema: *ref_398
+          - &ref_506
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17444,7 +18053,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''GetMonitoringData'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17454,11 +18083,11 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_503
           - *ref_504
           - *ref_505
+          - *ref_506
         responses:
-          - schema: *ref_506
+          - schema: *ref_507
             language:
               default:
                 name: ''
@@ -17526,8 +18155,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_507
-            schema: *ref_396
+          - &ref_508
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17544,8 +18173,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_508
-            schema: *ref_398
+          - &ref_509
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17562,8 +18191,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_509
-            schema: *ref_398
+          - &ref_510
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17582,7 +18211,27 @@ operationGroups:
                 in: path
           - *ref_391
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''Upgrade'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -17592,9 +18241,9 @@ operationGroups:
                 method: post
                 uri: '{$host}'
         signatureParameters:
-          - *ref_507
           - *ref_508
           - *ref_509
+          - *ref_510
         responses:
           - language:
               default:
@@ -17644,8 +18293,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_512
-            schema: *ref_396
+          - &ref_513
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17662,8 +18311,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_513
-            schema: *ref_398
+          - &ref_514
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17680,8 +18329,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_514
-            schema: *ref_398
+          - &ref_515
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17701,8 +18350,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_511
-                schema: *ref_510
+              - &ref_512
+                schema: *ref_511
                 implementation: Method
                 required: true
                 language:
@@ -17719,8 +18368,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''RemoveLinks'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_511
+              - *ref_512
             language:
               default:
                 name: ''
@@ -17734,9 +18401,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_512
           - *ref_513
           - *ref_514
+          - *ref_515
         responses:
           - language:
               default:
@@ -17788,8 +18455,8 @@ operationGroups:
         parameters:
           - *ref_389
           - *ref_390
-          - &ref_517
-            schema: *ref_396
+          - &ref_518
+            schema: *ref_397
             implementation: Method
             required: true
             language:
@@ -17806,8 +18473,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_518
-            schema: *ref_398
+          - &ref_519
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17824,8 +18491,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_519
-            schema: *ref_398
+          - &ref_520
+            schema: *ref_399
             implementation: Method
             required: true
             language:
@@ -17845,8 +18512,8 @@ operationGroups:
           - *ref_391
         requests:
           - parameters:
-              - &ref_516
-                schema: *ref_515
+              - &ref_517
+                schema: *ref_516
                 implementation: Method
                 required: true
                 language:
@@ -17863,8 +18530,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_392
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''IntegrationRuntimes'']$$operations[''CreateLinkedIntegrationRuntime'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_516
+              - *ref_517
             language:
               default:
                 name: ''
@@ -17878,9 +18563,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_517
           - *ref_518
           - *ref_519
+          - *ref_520
         responses:
           - schema: *ref_289
             language:
diff --git a/test/scenarios/managed-network/output/clicommon-000010-prename-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000010-prename-pre-simplified.yaml
index fc6a8fd..e7c655f 100644
--- a/test/scenarios/managed-network/output/clicommon-000010-prename-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000010-prename-pre-simplified.yaml
@@ -9,6 +9,7 @@ operationGroups:
             - parameterName: subscriptionId(string^string)
             - parameterName: resourceGroupName(string^string)
             - parameterName: managedNetworkName(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: CreateOrUpdate
           parameters:
             - parameterName: $host(string^string)
@@ -18,6 +19,7 @@ operationGroups:
             - parameterName: managedNetworkName(string^string)
             - parameterName[0]: managedNetwork(ManagedNetwork^object)
               bodySchema: ManagedNetwork
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Delete
           parameters:
             - parameterName: $host(string^string)
@@ -25,6 +27,7 @@ operationGroups:
             - parameterName: subscriptionId(string^string)
             - parameterName: resourceGroupName(string^string)
             - parameterName: managedNetworkName(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Update
           parameters:
             - parameterName: $host(string^string)
@@ -34,6 +37,7 @@ operationGroups:
             - parameterName: managedNetworkName(string^string)
             - parameterName[0]: parameters(ManagedNetworkUpdate^object)
               bodySchema: ManagedNetworkUpdate
+            - parameterName[0]: accept(Accept^constant)
         - operationName: ListByResourceGroup
           parameters:
             - parameterName: $host(string^string)
@@ -42,6 +46,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: $top(integer^integer)
             - parameterName: $skiptoken(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: ListBySubscription
           parameters:
             - parameterName: $host(string^string)
@@ -49,6 +54,7 @@ operationGroups:
             - parameterName: subscriptionId(string^string)
             - parameterName: $top(integer^integer)
             - parameterName: $skiptoken(string^string)
+            - parameterName[0]: accept(Accept^constant)
     - operationGroupName: ScopeAssignments
       operations:
         - operationName: Get
@@ -57,6 +63,7 @@ operationGroups:
             - parameterName: scope(string^string)
             - parameterName: scopeAssignmentName(string^string)
             - parameterName: ApiVersion(ApiVersion-2019-06-01-preview^constant)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: CreateOrUpdate
           parameters:
             - parameterName: $host(string^string)
@@ -65,6 +72,7 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2019-06-01-preview^constant)
             - parameterName[0]: parameters(ScopeAssignment^object)
               bodySchema: ScopeAssignment
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Delete
           parameters:
             - parameterName: $host(string^string)
@@ -76,6 +84,7 @@ operationGroups:
             - parameterName: $host(string^string)
             - parameterName: scope(string^string)
             - parameterName: ApiVersion(ApiVersion-2019-06-01-preview^constant)
+            - parameterName[0]: accept(Accept^constant)
     - operationGroupName: ManagedNetworkGroups
       operations:
         - operationName: Get
@@ -86,6 +95,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: managedNetworkName(string^string)
             - parameterName: managedNetworkGroupName(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: CreateOrUpdate
           parameters:
             - parameterName: $host(string^string)
@@ -96,6 +106,7 @@ operationGroups:
             - parameterName: managedNetworkGroupName(string^string)
             - parameterName[0]: managedNetworkGroup(ManagedNetworkGroup^object)
               bodySchema: ManagedNetworkGroup
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Delete
           parameters:
             - parameterName: $host(string^string)
@@ -104,6 +115,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: managedNetworkName(string^string)
             - parameterName: managedNetworkGroupName(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: ListByManagedNetwork
           parameters:
             - parameterName: $host(string^string)
@@ -113,6 +125,7 @@ operationGroups:
             - parameterName: managedNetworkName(string^string)
             - parameterName: $top(integer^integer)
             - parameterName: $skiptoken(string^string)
+            - parameterName[0]: accept(Accept^constant)
     - operationGroupName: ManagedNetworkPeeringPolicies
       operations:
         - operationName: Get
@@ -123,6 +136,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: managedNetworkName(string^string)
             - parameterName: managedNetworkPeeringPolicyName(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: CreateOrUpdate
           parameters:
             - parameterName: $host(string^string)
@@ -133,6 +147,7 @@ operationGroups:
             - parameterName: managedNetworkPeeringPolicyName(string^string)
             - parameterName[0]: managedNetworkPolicy(ManagedNetworkPeeringPolicy^object)
               bodySchema: ManagedNetworkPeeringPolicy
+            - parameterName[0]: accept(Accept^constant)
         - operationName: Delete
           parameters:
             - parameterName: $host(string^string)
@@ -141,6 +156,7 @@ operationGroups:
             - parameterName: resourceGroupName(string^string)
             - parameterName: managedNetworkName(string^string)
             - parameterName: managedNetworkPeeringPolicyName(string^string)
+            - parameterName[0]: accept(Accept^constant)
         - operationName: ListByManagedNetwork
           parameters:
             - parameterName: $host(string^string)
@@ -150,12 +166,14 @@ operationGroups:
             - parameterName: managedNetworkName(string^string)
             - parameterName: $top(integer^integer)
             - parameterName: $skiptoken(string^string)
+            - parameterName[0]: accept(Accept^constant)
     - operationGroupName: Operations
       operations:
         - operationName: List
           parameters:
             - parameterName: $host(string^string)
             - parameterName: ApiVersion(ApiVersion-2019-06-01-preview^constant)
+            - parameterName[0]: accept(Accept^constant)
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000010-prename-pre.yaml b/test/scenarios/managed-network/output/clicommon-000010-prename-pre.yaml
index 401b6b9..934da5c 100644
--- a/test/scenarios/managed-network/output/clicommon-000010-prename-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000010-prename-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 10
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -282,11 +282,20 @@ schemas:
           name: ApiVersion-2019-06-01-preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResource-tags
@@ -295,7 +304,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ManagedNetworkUpdate-tags
@@ -1030,7 +1038,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1061,7 +1069,7 @@ schemas:
           description: The error response that indicates why an operation has failed.
           namespace: ''
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1083,7 +1091,7 @@ schemas:
           description: Update Tags of Managed Network
           namespace: ''
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1123,7 +1131,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1161,7 +1169,7 @@ schemas:
           description: Result of the request to list ScopeAssignment. It contains a list of groups and a URL link to get the next set of results.
           namespace: ''
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1199,7 +1207,7 @@ schemas:
           description: Result of the request to list Managed Network Groups. It contains a list of groups and a URL link to get the next set of results.
           namespace: ''
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1237,7 +1245,7 @@ schemas:
           description: Result of the request to list Managed Network Peering Policies. It contains a list of policies and a URL link to get the next set of results.
           namespace: ''
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1432,7 +1440,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1444,7 +1452,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1457,7 +1465,21 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1467,8 +1489,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1483,7 +1505,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1542,7 +1564,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1554,7 +1576,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1568,7 +1590,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1580,8 +1602,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1595,8 +1629,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1623,7 +1657,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1725,7 +1759,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -1737,7 +1771,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -1750,7 +1784,21 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1760,8 +1808,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -1788,7 +1836,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1827,7 +1875,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -1839,7 +1887,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -1853,8 +1901,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -1865,8 +1913,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -1880,8 +1940,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -1908,7 +1968,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1998,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2010,8 +2070,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2021,7 +2081,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2035,7 +2095,21 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2045,11 +2119,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2062,7 +2136,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2126,8 +2200,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2137,7 +2211,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2151,7 +2225,21 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2161,10 +2249,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2177,7 +2265,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2245,7 +2333,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2347,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2273,7 +2361,21 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2283,8 +2385,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2299,7 +2401,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2336,7 +2438,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2353,7 +2455,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2368,7 +2470,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2380,8 +2482,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2395,8 +2509,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2423,7 +2537,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2474,7 +2588,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2488,7 +2602,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2512,8 +2626,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2551,7 +2665,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2567,7 +2681,21 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2577,9 +2705,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2592,7 +2720,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2645,7 +2773,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -2657,7 +2785,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -2669,7 +2797,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -2682,7 +2810,21 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2692,9 +2834,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -2709,7 +2851,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2758,7 +2900,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -2770,7 +2912,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -2782,7 +2924,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -2796,7 +2938,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -2808,8 +2950,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -2823,9 +2977,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -2852,7 +3006,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2928,7 +3082,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -2940,7 +3094,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -2952,7 +3106,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -2965,7 +3119,21 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2975,9 +3143,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3004,7 +3172,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3044,7 +3212,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3056,7 +3224,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3068,8 +3236,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3079,7 +3247,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3093,7 +3261,21 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3103,12 +3285,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3121,7 +3303,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3182,7 +3364,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3194,7 +3376,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3206,7 +3388,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3219,7 +3401,21 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3229,9 +3425,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3246,7 +3442,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3293,7 +3489,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3305,7 +3501,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3317,7 +3513,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3331,7 +3527,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3343,8 +3539,20 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3358,9 +3566,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3387,7 +3595,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3457,7 +3665,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3469,7 +3677,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3481,7 +3689,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3494,7 +3702,21 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3504,9 +3726,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3533,7 +3755,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3573,7 +3795,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -3585,7 +3807,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -3597,8 +3819,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3608,7 +3830,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -3622,7 +3844,21 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3632,12 +3868,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -3650,7 +3886,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3709,7 +3945,21 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3720,7 +3970,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -3733,7 +3983,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000020-prename-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000020-prename-post-simplified.yaml
index 827519e..0c214ba 100644
--- a/test/scenarios/managed-network/output/clicommon-000020-prename-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000020-prename-post-simplified.yaml
@@ -23,6 +23,9 @@ operationGroups:
             - parameterName: managedNetworkName(string^string)
               cli:
                 cliKey: managedNetworkName
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -46,6 +49,9 @@ operationGroups:
               cli:
                 cliKey: managedNetwork
               bodySchema: ManagedNetwork
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -65,6 +71,9 @@ operationGroups:
             - parameterName: managedNetworkName(string^string)
               cli:
                 cliKey: managedNetworkName
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Update
           cli:
             cliKey: Update
@@ -88,6 +97,9 @@ operationGroups:
               cli:
                 cliKey: parameters
               bodySchema: ManagedNetworkUpdate
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -110,6 +122,9 @@ operationGroups:
             - parameterName: $skiptoken(string^string)
               cli:
                 cliKey: $skiptoken
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: ListBySubscription
           cli:
             cliKey: ListBySubscription
@@ -129,6 +144,9 @@ operationGroups:
             - parameterName: $skiptoken(string^string)
               cli:
                 cliKey: $skiptoken
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: ScopeAssignments
       cli:
         cliKey: ScopeAssignments
@@ -149,6 +167,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2019-06-01-preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -169,6 +190,9 @@ operationGroups:
               cli:
                 cliKey: parameters
               bodySchema: ScopeAssignment
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -198,6 +222,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2019-06-01-preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: ManagedNetworkGroups
       cli:
         cliKey: ManagedNetworkGroups
@@ -224,6 +251,9 @@ operationGroups:
             - parameterName: managedNetworkGroupName(string^string)
               cli:
                 cliKey: managedNetworkGroupName
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -250,6 +280,9 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroup
               bodySchema: ManagedNetworkGroup
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -272,6 +305,9 @@ operationGroups:
             - parameterName: managedNetworkGroupName(string^string)
               cli:
                 cliKey: managedNetworkGroupName
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -297,6 +333,9 @@ operationGroups:
             - parameterName: $skiptoken(string^string)
               cli:
                 cliKey: $skiptoken
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: ManagedNetworkPeeringPolicies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -323,6 +362,9 @@ operationGroups:
             - parameterName: managedNetworkPeeringPolicyName(string^string)
               cli:
                 cliKey: managedNetworkPeeringPolicyName
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -349,6 +391,9 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPolicy
               bodySchema: ManagedNetworkPeeringPolicy
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -371,6 +416,9 @@ operationGroups:
             - parameterName: managedNetworkPeeringPolicyName(string^string)
               cli:
                 cliKey: managedNetworkPeeringPolicyName
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -396,6 +444,9 @@ operationGroups:
             - parameterName: $skiptoken(string^string)
               cli:
                 cliKey: $skiptoken
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: Operations
       cli:
         cliKey: Operations
@@ -410,6 +461,9 @@ operationGroups:
             - parameterName: ApiVersion(ApiVersion-2019-06-01-preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(Accept^constant)
+              cli:
+                cliKey: accept
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000020-prename-post.yaml b/test/scenarios/managed-network/output/clicommon-000020-prename-post.yaml
index ced997b..1502adb 100644
--- a/test/scenarios/managed-network/output/clicommon-000020-prename-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000020-prename-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 20
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -302,11 +302,20 @@ schemas:
           name: ApiVersion-2019-06-01-preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResource-tags
@@ -315,7 +324,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ManagedNetworkUpdate-tags
@@ -1144,7 +1152,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1181,7 +1189,7 @@ schemas:
         cli:
           cliKey: ErrorResponse
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1207,7 +1215,7 @@ schemas:
         cli:
           cliKey: ManagedNetworkUpdate
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1253,7 +1261,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1297,7 +1305,7 @@ schemas:
         cli:
           cliKey: ScopeAssignmentListResult
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1341,7 +1349,7 @@ schemas:
         cli:
           cliKey: ManagedNetworkGroupListResult
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1385,7 +1393,7 @@ schemas:
         cli:
           cliKey: ManagedNetworkPeeringPolicyListResult
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1606,7 +1614,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1620,7 +1628,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1635,7 +1643,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1645,8 +1669,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1661,7 +1685,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1722,7 +1746,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1736,7 +1760,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1752,7 +1776,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1766,8 +1790,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1781,8 +1819,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1809,7 +1847,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1913,7 +1951,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -1927,7 +1965,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -1942,7 +1980,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1952,8 +2006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -1980,7 +2034,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2021,7 +2075,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2035,7 +2089,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2051,8 +2105,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2065,8 +2119,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2080,8 +2148,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2108,7 +2176,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2200,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2214,8 +2282,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2227,7 +2295,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2243,7 +2311,23 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2253,11 +2337,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2270,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2336,8 +2420,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2349,7 +2433,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2365,7 +2449,23 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2375,10 +2475,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2391,7 +2491,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2463,7 +2563,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2479,7 +2579,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2495,7 +2595,23 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2505,8 +2621,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2521,7 +2637,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2560,7 +2676,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2579,7 +2695,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2596,7 +2712,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2610,8 +2726,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2625,8 +2755,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2653,7 +2783,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2706,7 +2836,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2722,7 +2852,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2748,8 +2878,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2789,7 +2919,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2807,7 +2937,23 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2817,9 +2963,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2832,7 +2978,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2889,7 +3035,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -2903,7 +3049,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -2917,7 +3063,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -2932,7 +3078,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2942,9 +3104,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -2959,7 +3121,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3010,7 +3172,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3024,7 +3186,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3038,7 +3200,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3054,7 +3216,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3068,8 +3230,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3083,9 +3259,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3112,7 +3288,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3190,7 +3366,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3204,7 +3380,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3218,7 +3394,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3233,7 +3409,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3243,9 +3435,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3272,7 +3464,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3314,7 +3506,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3328,7 +3520,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3342,8 +3534,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3355,7 +3547,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3371,7 +3563,23 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3381,12 +3589,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3399,7 +3607,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3464,7 +3672,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3478,7 +3686,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3492,7 +3700,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3507,7 +3715,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3517,9 +3741,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3534,7 +3758,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3583,7 +3807,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3597,7 +3821,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3611,7 +3835,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3627,7 +3851,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3641,8 +3865,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3656,9 +3894,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3685,7 +3923,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3757,7 +3995,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3771,7 +4009,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3785,7 +4023,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3800,7 +4038,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3810,9 +4064,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3839,7 +4093,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3881,7 +4135,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -3895,7 +4149,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -3909,8 +4163,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3922,7 +4176,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -3938,7 +4192,23 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3948,12 +4218,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -3966,7 +4236,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4029,7 +4299,23 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4040,7 +4326,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4053,7 +4339,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
index e6140ed..0337f34 100644
--- a/test/scenarios/managed-network/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000030-modeler-post-processor-pre-simplified.yaml
@@ -23,6 +23,9 @@ operationGroups:
             - parameterName: managed_network_name(string^string)
               cli:
                 cliKey: managedNetworkName
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -46,6 +49,9 @@ operationGroups:
               cli:
                 cliKey: managedNetwork
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: delete
           cli:
             cliKey: Delete
@@ -65,6 +71,9 @@ operationGroups:
             - parameterName: managed_network_name(string^string)
               cli:
                 cliKey: managedNetworkName
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: update
           cli:
             cliKey: Update
@@ -88,6 +97,9 @@ operationGroups:
               cli:
                 cliKey: parameters
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -110,6 +122,9 @@ operationGroups:
             - parameterName: skiptoken(string^string)
               cli:
                 cliKey: $skiptoken
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -129,6 +144,9 @@ operationGroups:
             - parameterName: skiptoken(string^string)
               cli:
                 cliKey: $skiptoken
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -149,6 +167,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2019_06_01_preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -169,6 +190,9 @@ operationGroups:
               cli:
                 cliKey: parameters
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: delete
           cli:
             cliKey: Delete
@@ -198,6 +222,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2019_06_01_preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -224,6 +251,9 @@ operationGroups:
             - parameterName: managed_network_group_name(string^string)
               cli:
                 cliKey: managedNetworkGroupName
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -250,6 +280,9 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroup
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: delete
           cli:
             cliKey: Delete
@@ -272,6 +305,9 @@ operationGroups:
             - parameterName: managed_network_group_name(string^string)
               cli:
                 cliKey: managedNetworkGroupName
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -297,6 +333,9 @@ operationGroups:
             - parameterName: skiptoken(string^string)
               cli:
                 cliKey: $skiptoken
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -323,6 +362,9 @@ operationGroups:
             - parameterName: managed_network_peering_policy_name(string^string)
               cli:
                 cliKey: managedNetworkPeeringPolicyName
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -349,6 +391,9 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPolicy
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: delete
           cli:
             cliKey: Delete
@@ -371,6 +416,9 @@ operationGroups:
             - parameterName: managed_network_peering_policy_name(string^string)
               cli:
                 cliKey: managedNetworkPeeringPolicyName
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -396,6 +444,9 @@ operationGroups:
             - parameterName: skiptoken(string^string)
               cli:
                 cliKey: $skiptoken
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -410,6 +461,9 @@ operationGroups:
             - parameterName: apiVersion(api_version2019_06_01_preview^constant)
               cli:
                 cliKey: ApiVersion
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000030-modeler-post-processor-pre.yaml b/test/scenarios/managed-network/output/clicommon-000030-modeler-post-processor-pre.yaml
index fd77b79..e0d3d8b 100644
--- a/test/scenarios/managed-network/output/clicommon-000030-modeler-post-processor-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000030-modeler-post-processor-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -302,11 +302,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -315,7 +324,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1144,7 +1152,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1181,7 +1189,7 @@ schemas:
         cli:
           cliKey: ErrorResponse
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1207,7 +1215,7 @@ schemas:
         cli:
           cliKey: ManagedNetworkUpdate
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1253,7 +1261,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1297,7 +1305,7 @@ schemas:
         cli:
           cliKey: ScopeAssignmentListResult
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1341,7 +1349,7 @@ schemas:
         cli:
           cliKey: ManagedNetworkGroupListResult
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1385,7 +1393,7 @@ schemas:
         cli:
           cliKey: ManagedNetworkPeeringPolicyListResult
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1606,7 +1614,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1620,7 +1628,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1635,7 +1643,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1645,8 +1669,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1661,7 +1685,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1722,7 +1746,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1736,7 +1760,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1752,7 +1776,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1766,8 +1790,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1781,8 +1819,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1809,7 +1847,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1913,7 +1951,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -1927,7 +1965,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -1942,7 +1980,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1952,8 +2006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -1980,7 +2034,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2021,7 +2075,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2035,7 +2089,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2051,8 +2105,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2065,8 +2119,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2080,8 +2148,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2108,7 +2176,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2200,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2214,8 +2282,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2227,7 +2295,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2243,7 +2311,23 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2253,11 +2337,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2270,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2336,8 +2420,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2349,7 +2433,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2365,7 +2449,23 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2375,10 +2475,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2391,7 +2491,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2463,7 +2563,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2479,7 +2579,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2495,7 +2595,23 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2505,8 +2621,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2521,7 +2637,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2560,7 +2676,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2579,7 +2695,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2596,7 +2712,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2610,8 +2726,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2625,8 +2755,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2653,7 +2783,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2706,7 +2836,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2722,7 +2852,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2748,8 +2878,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2789,7 +2919,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2807,7 +2937,23 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2817,9 +2963,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2832,7 +2978,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2889,7 +3035,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -2903,7 +3049,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -2917,7 +3063,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -2932,7 +3078,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2942,9 +3104,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -2959,7 +3121,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3010,7 +3172,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3024,7 +3186,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3038,7 +3200,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3054,7 +3216,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3068,8 +3230,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3083,9 +3259,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3112,7 +3288,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3190,7 +3366,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3204,7 +3380,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3218,7 +3394,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3233,7 +3409,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3243,9 +3435,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3272,7 +3464,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3314,7 +3506,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3328,7 +3520,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3342,8 +3534,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3355,7 +3547,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3371,7 +3563,23 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3381,12 +3589,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3399,7 +3607,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3464,7 +3672,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3478,7 +3686,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3492,7 +3700,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3507,7 +3715,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3517,9 +3741,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3534,7 +3758,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3583,7 +3807,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3597,7 +3821,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3611,7 +3835,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3627,7 +3851,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3641,8 +3865,22 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3656,9 +3894,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3685,7 +3923,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3757,7 +3995,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3771,7 +4009,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3785,7 +4023,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3800,7 +4038,23 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3810,9 +4064,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3839,7 +4093,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3881,7 +4135,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -3895,7 +4149,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -3909,8 +4163,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3922,7 +4176,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -3938,7 +4192,23 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3948,12 +4218,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -3966,7 +4236,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4029,7 +4299,23 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4040,7 +4326,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4053,7 +4339,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000040-modeler-post-processor-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
index 761c3d2..c9bea26 100644
--- a/test/scenarios/managed-network/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000040-modeler-post-processor-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000040-modeler-post-processor-post.yaml b/test/scenarios/managed-network/output/clicommon-000040-modeler-post-processor-post.yaml
index 3179590..c882ed4 100644
--- a/test/scenarios/managed-network/output/clicommon-000040-modeler-post-processor-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000040-modeler-post-processor-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -327,7 +336,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1203,7 +1211,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1243,7 +1251,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1271,7 +1279,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1320,7 +1328,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1367,7 +1375,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1414,7 +1422,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1461,7 +1469,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1695,7 +1703,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1710,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1726,7 +1734,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1736,8 +1761,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1752,7 +1777,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1814,7 +1839,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1829,7 +1854,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1846,7 +1871,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1861,8 +1886,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1876,8 +1916,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1904,7 +1944,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2009,7 +2049,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2024,7 +2064,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2040,7 +2080,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2050,8 +2107,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2078,7 +2135,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2120,7 +2177,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2135,7 +2192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2152,8 +2209,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2167,8 +2224,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2182,8 +2254,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2210,7 +2282,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2303,7 +2375,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2318,8 +2390,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2332,7 +2404,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2349,7 +2421,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2359,11 +2448,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2376,7 +2465,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2443,8 +2532,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2457,7 +2546,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2474,7 +2563,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2484,10 +2590,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2500,7 +2606,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2574,7 +2680,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2591,7 +2697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2608,7 +2714,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2618,8 +2741,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2634,7 +2757,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2674,7 +2797,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2694,7 +2817,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2712,7 +2835,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2727,8 +2850,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2742,8 +2880,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2770,7 +2908,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2824,7 +2962,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2841,7 +2979,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2868,8 +3006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2910,7 +3048,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2929,7 +3067,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2939,9 +3094,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2954,7 +3109,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3013,7 +3168,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3028,7 +3183,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3043,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3059,7 +3214,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3069,9 +3241,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3086,7 +3258,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3138,7 +3310,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3153,7 +3325,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3168,7 +3340,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3185,7 +3357,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3200,8 +3372,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3215,9 +3402,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3244,7 +3431,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3323,7 +3510,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3338,7 +3525,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3353,7 +3540,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3369,7 +3556,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3379,9 +3583,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3408,7 +3612,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3451,7 +3655,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3466,7 +3670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3481,8 +3685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3495,7 +3699,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3512,7 +3716,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3522,12 +3743,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3540,7 +3761,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3607,7 +3828,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3622,7 +3843,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3637,7 +3858,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3653,7 +3874,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3663,9 +3901,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3680,7 +3918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3730,7 +3968,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3745,7 +3983,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3760,7 +3998,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3777,7 +4015,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3792,8 +4030,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3807,9 +4060,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3836,7 +4089,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3909,7 +4162,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3924,7 +4177,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3939,7 +4192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3955,7 +4208,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3965,9 +4235,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3994,7 +4264,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4037,7 +4307,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4052,7 +4322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4067,8 +4337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4081,7 +4351,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4098,7 +4368,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4108,12 +4395,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4126,7 +4413,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4191,7 +4478,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4202,7 +4506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4215,7 +4519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000050-m4-flatten-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000050-m4-flatten-pre-simplified.yaml
index 761c3d2..c9bea26 100644
--- a/test/scenarios/managed-network/output/clicommon-000050-m4-flatten-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000050-m4-flatten-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000050-m4-flatten-pre.yaml b/test/scenarios/managed-network/output/clicommon-000050-m4-flatten-pre.yaml
index 3179590..c882ed4 100644
--- a/test/scenarios/managed-network/output/clicommon-000050-m4-flatten-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000050-m4-flatten-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -327,7 +336,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1203,7 +1211,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1243,7 +1251,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1271,7 +1279,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1320,7 +1328,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1367,7 +1375,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1414,7 +1422,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1461,7 +1469,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1695,7 +1703,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1710,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1726,7 +1734,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1736,8 +1761,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1752,7 +1777,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1814,7 +1839,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1829,7 +1854,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1846,7 +1871,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1861,8 +1886,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1876,8 +1916,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1904,7 +1944,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2009,7 +2049,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2024,7 +2064,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2040,7 +2080,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2050,8 +2107,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2078,7 +2135,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2120,7 +2177,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2135,7 +2192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2152,8 +2209,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2167,8 +2224,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2182,8 +2254,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2210,7 +2282,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2303,7 +2375,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2318,8 +2390,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2332,7 +2404,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2349,7 +2421,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2359,11 +2448,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2376,7 +2465,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2443,8 +2532,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2457,7 +2546,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2474,7 +2563,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2484,10 +2590,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2500,7 +2606,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2574,7 +2680,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2591,7 +2697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2608,7 +2714,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2618,8 +2741,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2634,7 +2757,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2674,7 +2797,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2694,7 +2817,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2712,7 +2835,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2727,8 +2850,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2742,8 +2880,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2770,7 +2908,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2824,7 +2962,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2841,7 +2979,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2868,8 +3006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2910,7 +3048,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2929,7 +3067,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2939,9 +3094,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2954,7 +3109,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3013,7 +3168,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3028,7 +3183,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3043,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3059,7 +3214,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3069,9 +3241,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3086,7 +3258,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3138,7 +3310,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3153,7 +3325,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3168,7 +3340,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3185,7 +3357,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3200,8 +3372,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3215,9 +3402,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3244,7 +3431,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3323,7 +3510,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3338,7 +3525,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3353,7 +3540,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3369,7 +3556,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3379,9 +3583,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3408,7 +3612,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3451,7 +3655,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3466,7 +3670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3481,8 +3685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3495,7 +3699,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3512,7 +3716,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3522,12 +3743,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3540,7 +3761,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3607,7 +3828,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3622,7 +3843,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3637,7 +3858,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3653,7 +3874,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3663,9 +3901,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3680,7 +3918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3730,7 +3968,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3745,7 +3983,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3760,7 +3998,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3777,7 +4015,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3792,8 +4030,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3807,9 +4060,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3836,7 +4089,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3909,7 +4162,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3924,7 +4177,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3939,7 +4192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3955,7 +4208,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3965,9 +4235,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3994,7 +4264,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4037,7 +4307,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4052,7 +4322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4067,8 +4337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4081,7 +4351,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4098,7 +4368,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4108,12 +4395,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4126,7 +4413,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4191,7 +4478,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4202,7 +4506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4215,7 +4519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000060-split-operation-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000060-split-operation-pre-simplified.yaml
index 761c3d2..c9bea26 100644
--- a/test/scenarios/managed-network/output/clicommon-000060-split-operation-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000060-split-operation-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000060-split-operation-pre.yaml b/test/scenarios/managed-network/output/clicommon-000060-split-operation-pre.yaml
index 3179590..c882ed4 100644
--- a/test/scenarios/managed-network/output/clicommon-000060-split-operation-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000060-split-operation-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -327,7 +336,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1203,7 +1211,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1243,7 +1251,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1271,7 +1279,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1320,7 +1328,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1367,7 +1375,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1414,7 +1422,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1461,7 +1469,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1695,7 +1703,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1710,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1726,7 +1734,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1736,8 +1761,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1752,7 +1777,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1814,7 +1839,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1829,7 +1854,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1846,7 +1871,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1861,8 +1886,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1876,8 +1916,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1904,7 +1944,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2009,7 +2049,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2024,7 +2064,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2040,7 +2080,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2050,8 +2107,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2078,7 +2135,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2120,7 +2177,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2135,7 +2192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2152,8 +2209,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2167,8 +2224,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2182,8 +2254,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2210,7 +2282,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2303,7 +2375,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2318,8 +2390,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2332,7 +2404,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2349,7 +2421,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2359,11 +2448,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2376,7 +2465,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2443,8 +2532,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2457,7 +2546,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2474,7 +2563,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2484,10 +2590,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2500,7 +2606,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2574,7 +2680,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2591,7 +2697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2608,7 +2714,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2618,8 +2741,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2634,7 +2757,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2674,7 +2797,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2694,7 +2817,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2712,7 +2835,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2727,8 +2850,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2742,8 +2880,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2770,7 +2908,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2824,7 +2962,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2841,7 +2979,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2868,8 +3006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2910,7 +3048,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2929,7 +3067,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2939,9 +3094,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2954,7 +3109,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3013,7 +3168,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3028,7 +3183,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3043,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3059,7 +3214,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3069,9 +3241,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3086,7 +3258,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3138,7 +3310,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3153,7 +3325,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3168,7 +3340,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3185,7 +3357,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3200,8 +3372,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3215,9 +3402,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3244,7 +3431,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3323,7 +3510,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3338,7 +3525,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3353,7 +3540,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3369,7 +3556,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3379,9 +3583,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3408,7 +3612,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3451,7 +3655,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3466,7 +3670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3481,8 +3685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3495,7 +3699,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3512,7 +3716,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3522,12 +3743,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3540,7 +3761,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3607,7 +3828,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3622,7 +3843,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3637,7 +3858,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3653,7 +3874,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3663,9 +3901,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3680,7 +3918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3730,7 +3968,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3745,7 +3983,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3760,7 +3998,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3777,7 +4015,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3792,8 +4030,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3807,9 +4060,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3836,7 +4089,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3909,7 +4162,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3924,7 +4177,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3939,7 +4192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3955,7 +4208,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3965,9 +4235,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3994,7 +4264,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4037,7 +4307,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4052,7 +4322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4067,8 +4337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4081,7 +4351,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4098,7 +4368,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4108,12 +4395,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4126,7 +4413,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4191,7 +4478,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4202,7 +4506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4215,7 +4519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000070-split-operation-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000070-split-operation-post-simplified.yaml
index 761c3d2..c9bea26 100644
--- a/test/scenarios/managed-network/output/clicommon-000070-split-operation-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000070-split-operation-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000070-split-operation-post.yaml b/test/scenarios/managed-network/output/clicommon-000070-split-operation-post.yaml
index 3179590..c882ed4 100644
--- a/test/scenarios/managed-network/output/clicommon-000070-split-operation-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000070-split-operation-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -327,7 +336,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1203,7 +1211,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1243,7 +1251,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1271,7 +1279,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1320,7 +1328,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1367,7 +1375,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1414,7 +1422,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1461,7 +1469,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1695,7 +1703,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1710,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1726,7 +1734,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1736,8 +1761,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1752,7 +1777,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1814,7 +1839,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1829,7 +1854,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1846,7 +1871,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1861,8 +1886,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1876,8 +1916,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1904,7 +1944,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2009,7 +2049,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2024,7 +2064,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2040,7 +2080,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2050,8 +2107,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2078,7 +2135,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2120,7 +2177,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2135,7 +2192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2152,8 +2209,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2167,8 +2224,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2182,8 +2254,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2210,7 +2282,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2303,7 +2375,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2318,8 +2390,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2332,7 +2404,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2349,7 +2421,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2359,11 +2448,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2376,7 +2465,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2443,8 +2532,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2457,7 +2546,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2474,7 +2563,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2484,10 +2590,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2500,7 +2606,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2574,7 +2680,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2591,7 +2697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2608,7 +2714,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2618,8 +2741,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2634,7 +2757,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2674,7 +2797,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2694,7 +2817,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2712,7 +2835,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2727,8 +2850,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2742,8 +2880,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2770,7 +2908,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2824,7 +2962,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2841,7 +2979,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2868,8 +3006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2910,7 +3048,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2929,7 +3067,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2939,9 +3094,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2954,7 +3109,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3013,7 +3168,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3028,7 +3183,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3043,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3059,7 +3214,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3069,9 +3241,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3086,7 +3258,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3138,7 +3310,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3153,7 +3325,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3168,7 +3340,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3185,7 +3357,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3200,8 +3372,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3215,9 +3402,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3244,7 +3431,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3323,7 +3510,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3338,7 +3525,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3353,7 +3540,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3369,7 +3556,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3379,9 +3583,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3408,7 +3612,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3451,7 +3655,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3466,7 +3670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3481,8 +3685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3495,7 +3699,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3512,7 +3716,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3522,12 +3743,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3540,7 +3761,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3607,7 +3828,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3622,7 +3843,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3637,7 +3858,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3653,7 +3874,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3663,9 +3901,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3680,7 +3918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3730,7 +3968,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3745,7 +3983,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3760,7 +3998,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3777,7 +4015,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3792,8 +4030,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3807,9 +4060,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3836,7 +4089,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3909,7 +4162,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3924,7 +4177,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3939,7 +4192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3955,7 +4208,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3965,9 +4235,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3994,7 +4264,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4037,7 +4307,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4052,7 +4322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4067,8 +4337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4081,7 +4351,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4098,7 +4368,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4108,12 +4395,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4126,7 +4413,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4191,7 +4478,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4202,7 +4506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4215,7 +4519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000080-m4-flatten-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000080-m4-flatten-post-simplified.yaml
index 761c3d2..c9bea26 100644
--- a/test/scenarios/managed-network/output/clicommon-000080-m4-flatten-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000080-m4-flatten-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000080-m4-flatten-post.yaml b/test/scenarios/managed-network/output/clicommon-000080-m4-flatten-post.yaml
index 3179590..c882ed4 100644
--- a/test/scenarios/managed-network/output/clicommon-000080-m4-flatten-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000080-m4-flatten-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -327,7 +336,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1203,7 +1211,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1243,7 +1251,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1271,7 +1279,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1320,7 +1328,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1367,7 +1375,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1414,7 +1422,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1461,7 +1469,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1695,7 +1703,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1710,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1726,7 +1734,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1736,8 +1761,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1752,7 +1777,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1814,7 +1839,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1829,7 +1854,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1846,7 +1871,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1861,8 +1886,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1876,8 +1916,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1904,7 +1944,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2009,7 +2049,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2024,7 +2064,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2040,7 +2080,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2050,8 +2107,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2078,7 +2135,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2120,7 +2177,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2135,7 +2192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2152,8 +2209,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2167,8 +2224,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2182,8 +2254,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2210,7 +2282,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2303,7 +2375,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2318,8 +2390,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2332,7 +2404,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2349,7 +2421,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2359,11 +2448,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2376,7 +2465,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2443,8 +2532,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2457,7 +2546,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2474,7 +2563,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2484,10 +2590,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2500,7 +2606,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2574,7 +2680,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2591,7 +2697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2608,7 +2714,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2618,8 +2741,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2634,7 +2757,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2674,7 +2797,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2694,7 +2817,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2712,7 +2835,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2727,8 +2850,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2742,8 +2880,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2770,7 +2908,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2824,7 +2962,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2841,7 +2979,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2868,8 +3006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2910,7 +3048,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2929,7 +3067,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2939,9 +3094,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2954,7 +3109,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3013,7 +3168,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3028,7 +3183,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3043,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3059,7 +3214,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3069,9 +3241,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3086,7 +3258,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3138,7 +3310,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3153,7 +3325,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3168,7 +3340,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3185,7 +3357,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3200,8 +3372,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3215,9 +3402,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3244,7 +3431,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3323,7 +3510,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3338,7 +3525,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3353,7 +3540,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3369,7 +3556,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3379,9 +3583,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3408,7 +3612,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3451,7 +3655,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3466,7 +3670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3481,8 +3685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3495,7 +3699,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3512,7 +3716,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3522,12 +3743,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3540,7 +3761,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3607,7 +3828,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3622,7 +3843,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3637,7 +3858,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3653,7 +3874,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3663,9 +3901,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3680,7 +3918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3730,7 +3968,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3745,7 +3983,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3760,7 +3998,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3777,7 +4015,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3792,8 +4030,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3807,9 +4060,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3836,7 +4089,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3909,7 +4162,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3924,7 +4177,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3939,7 +4192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3955,7 +4208,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3965,9 +4235,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3994,7 +4264,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4037,7 +4307,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4052,7 +4322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4067,8 +4337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4081,7 +4351,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4098,7 +4368,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4108,12 +4395,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4126,7 +4413,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4191,7 +4478,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4202,7 +4506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4215,7 +4519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000090-complex-marker-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000090-complex-marker-pre-simplified.yaml
index 761c3d2..c9bea26 100644
--- a/test/scenarios/managed-network/output/clicommon-000090-complex-marker-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000090-complex-marker-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000090-complex-marker-pre.yaml b/test/scenarios/managed-network/output/clicommon-000090-complex-marker-pre.yaml
index 3179590..c882ed4 100644
--- a/test/scenarios/managed-network/output/clicommon-000090-complex-marker-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000090-complex-marker-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -327,7 +336,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1203,7 +1211,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1243,7 +1251,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1271,7 +1279,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1320,7 +1328,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1367,7 +1375,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1414,7 +1422,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1461,7 +1469,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1695,7 +1703,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1710,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1726,7 +1734,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1736,8 +1761,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1752,7 +1777,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1814,7 +1839,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1829,7 +1854,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1846,7 +1871,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1861,8 +1886,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1876,8 +1916,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1904,7 +1944,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2009,7 +2049,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2024,7 +2064,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2040,7 +2080,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2050,8 +2107,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2078,7 +2135,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2120,7 +2177,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2135,7 +2192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2152,8 +2209,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2167,8 +2224,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2182,8 +2254,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2210,7 +2282,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2303,7 +2375,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2318,8 +2390,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2332,7 +2404,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2349,7 +2421,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2359,11 +2448,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2376,7 +2465,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2443,8 +2532,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2457,7 +2546,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2474,7 +2563,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2484,10 +2590,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2500,7 +2606,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2574,7 +2680,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2591,7 +2697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2608,7 +2714,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2618,8 +2741,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2634,7 +2757,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2674,7 +2797,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2694,7 +2817,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2712,7 +2835,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2727,8 +2850,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2742,8 +2880,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2770,7 +2908,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2824,7 +2962,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2841,7 +2979,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2868,8 +3006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2910,7 +3048,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2929,7 +3067,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2939,9 +3094,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2954,7 +3109,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3013,7 +3168,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3028,7 +3183,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3043,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3059,7 +3214,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3069,9 +3241,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3086,7 +3258,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3138,7 +3310,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3153,7 +3325,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3168,7 +3340,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3185,7 +3357,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3200,8 +3372,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3215,9 +3402,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3244,7 +3431,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3323,7 +3510,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3338,7 +3525,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3353,7 +3540,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3369,7 +3556,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3379,9 +3583,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3408,7 +3612,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3451,7 +3655,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3466,7 +3670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3481,8 +3685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3495,7 +3699,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3512,7 +3716,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3522,12 +3743,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3540,7 +3761,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3607,7 +3828,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3622,7 +3843,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3637,7 +3858,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3653,7 +3874,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3663,9 +3901,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3680,7 +3918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3730,7 +3968,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3745,7 +3983,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3760,7 +3998,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3777,7 +4015,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3792,8 +4030,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3807,9 +4060,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3836,7 +4089,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3909,7 +4162,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3924,7 +4177,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3939,7 +4192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3955,7 +4208,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3965,9 +4235,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3994,7 +4264,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4037,7 +4307,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4052,7 +4322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4067,8 +4337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4081,7 +4351,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4098,7 +4368,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4108,12 +4395,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4126,7 +4413,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4191,7 +4478,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4202,7 +4506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4215,7 +4519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000100-complex-marker-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000100-complex-marker-post-simplified.yaml
index adb1db8..7d1f07d 100644
--- a/test/scenarios/managed-network/output/clicommon-000100-complex-marker-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000100-complex-marker-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000100-complex-marker-post.yaml b/test/scenarios/managed-network/output/clicommon-000100-complex-marker-post.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000100-complex-marker-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000100-complex-marker-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000110-m4namer-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000110-m4namer-pre-simplified.yaml
index 761c3d2..c9bea26 100644
--- a/test/scenarios/managed-network/output/clicommon-000110-m4namer-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000110-m4namer-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000110-m4namer-pre.yaml b/test/scenarios/managed-network/output/clicommon-000110-m4namer-pre.yaml
index 3179590..c882ed4 100644
--- a/test/scenarios/managed-network/output/clicommon-000110-m4namer-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000110-m4namer-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -327,7 +336,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1203,7 +1211,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1243,7 +1251,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1271,7 +1279,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1320,7 +1328,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1367,7 +1375,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1414,7 +1422,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1461,7 +1469,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1695,7 +1703,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1710,7 +1718,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1726,7 +1734,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1736,8 +1761,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1752,7 +1777,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1814,7 +1839,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1829,7 +1854,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1846,7 +1871,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1861,8 +1886,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1876,8 +1916,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -1904,7 +1944,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2009,7 +2049,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2024,7 +2064,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2040,7 +2080,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2050,8 +2107,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2078,7 +2135,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2120,7 +2177,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2135,7 +2192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2152,8 +2209,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2167,8 +2224,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2182,8 +2254,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2210,7 +2282,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2303,7 +2375,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2318,8 +2390,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2332,7 +2404,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2349,7 +2421,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2359,11 +2448,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2376,7 +2465,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2443,8 +2532,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2457,7 +2546,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2474,7 +2563,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2484,10 +2590,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2500,7 +2606,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2574,7 +2680,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2591,7 +2697,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2608,7 +2714,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2618,8 +2741,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2634,7 +2757,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2674,7 +2797,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2694,7 +2817,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2712,7 +2835,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2727,8 +2850,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2742,8 +2880,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2770,7 +2908,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2824,7 +2962,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2841,7 +2979,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2868,8 +3006,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -2910,7 +3048,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -2929,7 +3067,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2939,9 +3094,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -2954,7 +3109,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3013,7 +3168,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3028,7 +3183,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3043,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3059,7 +3214,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3069,9 +3241,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3086,7 +3258,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3138,7 +3310,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3153,7 +3325,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3168,7 +3340,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3185,7 +3357,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3200,8 +3372,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3215,9 +3402,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3244,7 +3431,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3323,7 +3510,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3338,7 +3525,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3353,7 +3540,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3369,7 +3556,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3379,9 +3583,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3408,7 +3612,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3451,7 +3655,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3466,7 +3670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3481,8 +3685,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3495,7 +3699,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3512,7 +3716,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3522,12 +3743,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3540,7 +3761,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3607,7 +3828,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3622,7 +3843,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3637,7 +3858,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3653,7 +3874,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3663,9 +3901,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3680,7 +3918,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3730,7 +3968,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3745,7 +3983,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3760,7 +3998,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3777,7 +4015,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3792,8 +4030,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3807,9 +4060,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3836,7 +4089,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3909,7 +4162,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -3924,7 +4177,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -3939,7 +4192,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -3955,7 +4208,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3965,9 +4235,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -3994,7 +4264,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4037,7 +4307,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4052,7 +4322,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4067,8 +4337,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4081,7 +4351,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4098,7 +4368,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4108,12 +4395,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4126,7 +4413,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4191,7 +4478,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4202,7 +4506,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4215,7 +4519,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000120-m4namer-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000120-m4namer-post-simplified.yaml
index 44d826e..6fa33f1 100644
--- a/test/scenarios/managed-network/output/clicommon-000120-m4namer-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000120-m4namer-post-simplified.yaml
@@ -37,6 +37,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -74,6 +79,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
                 cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: ManagedNetwork
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -105,6 +115,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -142,6 +157,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: ManagedNetworkUpdate
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -178,6 +198,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -209,6 +234,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: ScopeAssignments
       cli:
         cliKey: ScopeAssignments
@@ -241,6 +271,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -273,6 +308,11 @@ operationGroups:
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: ScopeAssignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -320,6 +360,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkGroups
       cli:
         cliKey: ManagedNetworkGroups
@@ -362,6 +407,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -404,6 +454,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: ManagedNetworkGroup
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -440,6 +495,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -481,6 +541,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkPeeringPolicies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -523,6 +588,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -565,6 +635,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: ManagedNetworkPeeringPolicy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -601,6 +676,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -642,6 +722,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: Operations
       cli:
         cliKey: Operations
@@ -664,6 +749,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000120-m4namer-post.yaml b/test/scenarios/managed-network/output/clicommon-000120-m4namer-post.yaml
index 2ee8943..f0230b0 100644
--- a/test/scenarios/managed-network/output/clicommon-000120-m4namer-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000120-m4namer-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -324,11 +324,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -337,7 +346,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ManagedNetworkUpdateTags
@@ -1263,7 +1271,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1306,7 +1314,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
           cliPath: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1336,7 +1344,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
           cliPath: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1388,7 +1396,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1438,7 +1446,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
           cliPath: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1488,7 +1496,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1538,7 +1546,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1785,7 +1793,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1801,7 +1809,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1818,7 +1826,25 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1828,8 +1854,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1844,7 +1870,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -1907,7 +1933,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -1923,7 +1949,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -1941,7 +1967,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -1957,8 +1983,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -1972,8 +2014,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2000,7 +2042,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2106,7 +2148,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2122,7 +2164,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2139,7 +2181,25 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2149,8 +2209,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2177,7 +2237,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2220,7 +2280,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2236,7 +2296,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2254,8 +2314,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2270,8 +2330,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2285,8 +2361,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2313,7 +2389,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2407,7 +2483,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2423,8 +2499,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2438,7 +2514,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2456,7 +2532,25 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2466,11 +2560,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2483,7 +2577,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2551,8 +2645,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2566,7 +2660,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2584,7 +2678,25 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2594,10 +2706,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2610,7 +2722,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2686,7 +2798,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2704,7 +2816,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2722,7 +2834,25 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2732,8 +2862,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2748,7 +2878,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2789,7 +2919,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2940,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2829,7 +2959,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2845,8 +2975,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2860,8 +3006,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2888,7 +3034,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2943,7 +3089,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -2961,7 +3107,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -2989,8 +3135,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3032,7 +3178,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3052,7 +3198,25 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3062,9 +3226,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3077,7 +3241,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3138,7 +3302,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3154,7 +3318,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3170,7 +3334,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3187,7 +3351,25 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3197,9 +3379,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3214,7 +3396,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3267,7 +3449,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3283,7 +3465,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3299,7 +3481,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3317,7 +3499,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3333,8 +3515,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3348,9 +3546,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3377,7 +3575,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3457,7 +3655,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3473,7 +3671,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3489,7 +3687,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3506,7 +3704,25 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3516,9 +3732,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3545,7 +3761,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3589,7 +3805,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3605,7 +3821,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3621,8 +3837,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3636,7 +3852,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3654,7 +3870,25 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3664,12 +3898,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3682,7 +3916,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3751,7 +3985,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3767,7 +4001,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3783,7 +4017,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3800,7 +4034,25 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3810,9 +4062,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3827,7 +4079,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3878,7 +4130,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3894,7 +4146,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3910,7 +4162,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3928,7 +4180,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -3944,8 +4196,24 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -3959,9 +4227,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -3988,7 +4256,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4062,7 +4330,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4078,7 +4346,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4094,7 +4362,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4111,7 +4379,25 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4121,9 +4407,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4150,7 +4436,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4194,7 +4480,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4210,7 +4496,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4226,8 +4512,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4241,7 +4527,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4259,7 +4545,25 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4269,12 +4573,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4287,7 +4591,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4354,7 +4658,25 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4365,7 +4687,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4378,7 +4700,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000130-flatten-set-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000130-flatten-set-pre-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000130-flatten-set-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000130-flatten-set-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000130-flatten-set-pre.yaml b/test/scenarios/managed-network/output/clicommon-000130-flatten-set-pre.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000130-flatten-set-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000130-flatten-set-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000140-flatten-set-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000140-flatten-set-post-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000140-flatten-set-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000140-flatten-set-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000140-flatten-set-post.yaml b/test/scenarios/managed-network/output/clicommon-000140-flatten-set-post.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000140-flatten-set-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000140-flatten-set-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000150-flatten-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000150-flatten-pre-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000150-flatten-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000150-flatten-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000150-flatten-pre.yaml b/test/scenarios/managed-network/output/clicommon-000150-flatten-pre.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000150-flatten-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000150-flatten-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000160-flatten-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000160-flatten-post-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000160-flatten-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000160-flatten-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000160-flatten-post.yaml b/test/scenarios/managed-network/output/clicommon-000160-flatten-post.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000160-flatten-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000160-flatten-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000170-poly-as-resource-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000170-poly-as-resource-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000170-poly-as-resource-pre.yaml b/test/scenarios/managed-network/output/clicommon-000170-poly-as-resource-pre.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000170-poly-as-resource-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000170-poly-as-resource-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000180-poly-as-resource-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000180-poly-as-resource-post-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000180-poly-as-resource-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000180-poly-as-resource-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000180-poly-as-resource-post.yaml b/test/scenarios/managed-network/output/clicommon-000180-poly-as-resource-post.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000180-poly-as-resource-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000180-poly-as-resource-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000190-flatten-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000190-flatten-pre-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000190-flatten-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000190-flatten-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000190-flatten-pre.yaml b/test/scenarios/managed-network/output/clicommon-000190-flatten-pre.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000190-flatten-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000190-flatten-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000200-flatten-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000200-flatten-post-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000200-flatten-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000200-flatten-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000200-flatten-post.yaml b/test/scenarios/managed-network/output/clicommon-000200-flatten-post.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000200-flatten-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000200-flatten-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000210-modifier-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000210-modifier-pre-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000210-modifier-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000210-modifier-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000210-modifier-pre.yaml b/test/scenarios/managed-network/output/clicommon-000210-modifier-pre.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000210-modifier-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000210-modifier-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000220-modifier-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000220-modifier-post-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000220-modifier-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000220-modifier-post-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000220-modifier-post.yaml b/test/scenarios/managed-network/output/clicommon-000220-modifier-post.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000220-modifier-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000220-modifier-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000230-namer-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000230-namer-pre-simplified.yaml
index c656674..e4e3943 100644
--- a/test/scenarios/managed-network/output/clicommon-000230-namer-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000230-namer-pre-simplified.yaml
@@ -30,6 +30,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -60,6 +64,10 @@ operationGroups:
                 cliKey: managedNetwork
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: managed_network
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -85,6 +93,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: update
           cli:
             cliKey: Update
@@ -115,6 +127,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: managed_network_update
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: list_by_resource_group
           cli:
             cliKey: ListByResourceGroup
@@ -144,6 +160,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: list_by_subscription
           cli:
             cliKey: ListBySubscription
@@ -169,6 +189,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: scope_assignments
       cli:
         cliKey: ScopeAssignments
@@ -195,6 +219,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -221,6 +249,10 @@ operationGroups:
                 cliKey: parameters
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: scope_assignment
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -259,6 +291,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_groups
       cli:
         cliKey: ManagedNetworkGroups
@@ -293,6 +329,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -327,6 +367,10 @@ operationGroups:
                 cliKey: managedNetworkGroup
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: managed_network_group
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -356,6 +400,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -389,6 +437,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: managed_network_peering_policies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -423,6 +475,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: create_or_update
           cli:
             cliKey: CreateOrUpdate
@@ -457,6 +513,10 @@ operationGroups:
                 cliKey: managedNetworkPolicy
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: managed_network_peering_policy
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: delete
           cli:
             cliKey: Delete
@@ -486,6 +546,10 @@ operationGroups:
               cli:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: list_by_managed_network
           cli:
             cliKey: ListByManagedNetwork
@@ -519,6 +583,10 @@ operationGroups:
               cli:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: operations
       cli:
         cliKey: Operations
@@ -537,6 +605,10 @@ operationGroups:
               cli:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
+            - parameterName[0]: accept(accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000230-namer-pre.yaml b/test/scenarios/managed-network/output/clicommon-000230-namer-pre.yaml
index f866246..4f1db94 100644
--- a/test/scenarios/managed-network/output/clicommon-000230-namer-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000230-namer-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -314,11 +314,20 @@ schemas:
           name: api_version2019_06_01_preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: tracked_resource_tags
@@ -330,7 +339,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: managed_network_update_tags
@@ -1347,7 +1355,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1393,7 +1401,7 @@ schemas:
           cliKey: ErrorResponse
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1427,7 +1435,7 @@ schemas:
           cliKey: ManagedNetworkUpdate
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1485,7 +1493,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1541,7 +1549,7 @@ schemas:
           cliKey: ScopeAssignmentListResult
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1597,7 +1605,7 @@ schemas:
           cliKey: ManagedNetworkGroupListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1653,7 +1661,7 @@ schemas:
           cliKey: ManagedNetworkPeeringPolicyListResult
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1914,7 +1922,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -1929,7 +1937,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -1945,7 +1953,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -1955,8 +1980,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -1971,7 +1996,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2033,7 +2058,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2048,7 +2073,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2065,7 +2090,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2080,8 +2105,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2095,8 +2135,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2123,7 +2163,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2228,7 +2268,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2243,7 +2283,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2259,7 +2299,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2269,8 +2326,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2297,7 +2354,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2339,7 +2396,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2354,7 +2411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2371,8 +2428,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2386,8 +2443,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2401,8 +2473,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2429,7 +2501,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2522,7 +2594,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2537,8 +2609,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2551,7 +2623,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2568,7 +2640,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2578,11 +2667,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2595,7 +2684,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2662,8 +2751,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2676,7 +2765,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -2693,7 +2782,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2703,10 +2809,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -2719,7 +2825,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2793,7 +2899,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -2810,7 +2916,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -2827,7 +2933,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2837,8 +2960,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -2853,7 +2976,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2893,7 +3016,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -2913,7 +3036,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -2931,7 +3054,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -2946,8 +3069,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -2961,8 +3099,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -2989,7 +3127,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3043,7 +3181,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3060,7 +3198,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3087,8 +3225,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3129,7 +3267,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3148,7 +3286,24 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3158,9 +3313,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3173,7 +3328,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3232,7 +3387,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3247,7 +3402,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3262,7 +3417,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3278,7 +3433,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3288,9 +3460,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3305,7 +3477,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3357,7 +3529,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3544,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3387,7 +3559,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3404,7 +3576,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3419,8 +3591,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3434,9 +3621,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3463,7 +3650,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3542,7 +3729,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -3557,7 +3744,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -3572,7 +3759,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -3588,7 +3775,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3598,9 +3802,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -3627,7 +3831,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3670,7 +3874,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -3685,7 +3889,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -3700,8 +3904,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3714,7 +3918,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -3731,7 +3935,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3741,12 +3962,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -3759,7 +3980,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3826,7 +4047,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -3841,7 +4062,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -3856,7 +4077,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -3872,7 +4093,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3882,9 +4120,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -3899,7 +4137,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3949,7 +4187,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -3964,7 +4202,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -3979,7 +4217,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -3996,7 +4234,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4011,8 +4249,23 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4026,9 +4279,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4055,7 +4308,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4128,7 +4381,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4143,7 +4396,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4158,7 +4411,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4174,7 +4427,24 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4184,9 +4454,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4213,7 +4483,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4256,7 +4526,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4271,7 +4541,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4286,8 +4556,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4300,7 +4570,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4317,7 +4587,24 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4327,12 +4614,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4345,7 +4632,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4410,7 +4697,24 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4421,7 +4725,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -4434,7 +4738,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000240-namer-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000240-namer-post-simplified.yaml
index 491c157..83a7a22 100644
--- a/test/scenarios/managed-network/output/clicommon-000240-namer-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000240-namer-post-simplified.yaml
@@ -38,6 +38,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -75,6 +80,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
                 cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: ManagedNetwork
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -106,6 +116,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -143,6 +158,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: ManagedNetworkUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -179,6 +199,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: ListBySubscription
           cli:
             cliKey: ListBySubscription
@@ -210,6 +235,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: ScopeAssignments
       cli:
         cliKey: ScopeAssignments
@@ -243,6 +273,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -275,6 +310,11 @@ operationGroups:
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: ScopeAssignment
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -322,6 +362,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkGroups
       cli:
         cliKey: ManagedNetworkGroups
@@ -365,6 +410,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -407,6 +457,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: ManagedNetworkGroup
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -443,6 +498,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -484,6 +544,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkPeeringPolicies
       cli:
         cliKey: ManagedNetworkPeeringPolicies
@@ -527,6 +592,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -569,6 +639,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: ManagedNetworkPeeringPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -605,6 +680,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -646,6 +726,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: Operations
       cli:
         cliKey: Operations
@@ -669,6 +754,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000240-namer-post.yaml b/test/scenarios/managed-network/output/clicommon-000240-namer-post.yaml
index 52bed1e..227fa96 100644
--- a/test/scenarios/managed-network/output/clicommon-000240-namer-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000240-namer-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -410,11 +410,23 @@ schemas:
           name: ApiVersion20190601Preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -428,7 +440,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ManagedNetworkUpdateTags
@@ -1617,7 +1628,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1672,7 +1683,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
           cliPath: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1712,7 +1723,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
           cliPath: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1781,7 +1792,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1848,7 +1859,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
           cliPath: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1915,7 +1926,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1982,7 +1993,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -2288,7 +2299,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -2306,7 +2317,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -2325,7 +2336,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2335,8 +2366,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -2351,7 +2382,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2416,7 +2447,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2434,7 +2465,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2454,7 +2485,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2472,8 +2503,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2487,8 +2536,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2515,7 +2564,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2623,7 +2672,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2641,7 +2690,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2660,7 +2709,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2670,8 +2739,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2698,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2743,7 +2812,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2761,7 +2830,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2781,8 +2850,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2799,8 +2868,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2814,8 +2901,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2842,7 +2929,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2938,7 +3025,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2956,8 +3043,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2973,7 +3060,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2995,7 +3082,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3005,11 +3112,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3022,7 +3129,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3092,8 +3199,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3109,7 +3216,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -3131,7 +3238,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3141,10 +3268,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3157,7 +3284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3237,7 +3364,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -3257,7 +3384,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -3277,7 +3404,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3287,8 +3434,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -3303,7 +3450,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3346,7 +3493,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3519,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -3393,7 +3540,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -3411,8 +3558,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -3426,8 +3591,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -3454,7 +3619,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3511,7 +3676,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3531,7 +3696,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3561,8 +3726,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3606,7 +3771,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3628,7 +3793,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3638,9 +3823,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3653,7 +3838,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3718,7 +3903,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3736,7 +3921,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3754,7 +3939,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3773,7 +3958,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3783,9 +3988,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3800,7 +4005,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3855,7 +4060,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3873,7 +4078,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3891,7 +4096,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3911,7 +4116,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3929,8 +4134,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3944,9 +4167,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3973,7 +4196,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4055,7 +4278,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -4073,7 +4296,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -4091,7 +4314,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -4110,7 +4333,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4120,9 +4363,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -4149,7 +4392,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4195,7 +4438,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -4213,7 +4456,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -4231,8 +4474,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4248,7 +4491,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -4270,7 +4513,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4280,12 +4543,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -4298,7 +4561,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4371,7 +4634,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -4389,7 +4652,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -4407,7 +4670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -4426,7 +4689,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4436,9 +4719,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -4453,7 +4736,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4506,7 +4789,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -4524,7 +4807,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -4542,7 +4825,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -4562,7 +4845,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4580,8 +4863,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4595,9 +4896,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4624,7 +4925,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4700,7 +5001,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4718,7 +5019,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4736,7 +5037,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4755,7 +5056,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4765,9 +5086,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4794,7 +5115,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4840,7 +5161,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4858,7 +5179,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4876,8 +5197,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4893,7 +5214,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4915,7 +5236,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4925,12 +5266,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4943,7 +5284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -5014,7 +5355,27 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -5025,7 +5386,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -5038,7 +5399,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000250-test-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000250-test-pre-simplified.yaml
index eadbab8..2cbff5f 100644
--- a/test/scenarios/managed-network/output/clicommon-000250-test-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000250-test-pre-simplified.yaml
@@ -38,6 +38,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -75,6 +80,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
                 cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: ManagedNetwork
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -106,6 +116,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -143,6 +158,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: ManagedNetworkUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -179,6 +199,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: ListBySubscription
           cli:
             cliKey: ListBySubscription
@@ -210,6 +235,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: ScopeAssignments
       cli:
         name: ScopeAssignment
@@ -243,6 +273,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -275,6 +310,11 @@ operationGroups:
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: ScopeAssignment
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -322,6 +362,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkGroups
       cli:
         name: ManagedNetworkGroup
@@ -365,6 +410,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -407,6 +457,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: ManagedNetworkGroup
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -443,6 +498,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -484,6 +544,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkPeeringPolicies
       cli:
         name: ManagedNetworkPeeringPolicy
@@ -527,6 +592,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -569,6 +639,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: ManagedNetworkPeeringPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -605,6 +680,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -646,6 +726,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: Operations
       cli:
         name: Operation
@@ -669,6 +754,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000250-test-pre.yaml b/test/scenarios/managed-network/output/clicommon-000250-test-pre.yaml
index 52bed1e..227fa96 100644
--- a/test/scenarios/managed-network/output/clicommon-000250-test-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000250-test-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -410,11 +410,23 @@ schemas:
           name: ApiVersion20190601Preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -428,7 +440,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ManagedNetworkUpdateTags
@@ -1617,7 +1628,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1672,7 +1683,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
           cliPath: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1712,7 +1723,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
           cliPath: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1781,7 +1792,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1848,7 +1859,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
           cliPath: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1915,7 +1926,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1982,7 +1993,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -2288,7 +2299,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -2306,7 +2317,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -2325,7 +2336,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2335,8 +2366,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -2351,7 +2382,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2416,7 +2447,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2434,7 +2465,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2454,7 +2485,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2472,8 +2503,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2487,8 +2536,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2515,7 +2564,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2623,7 +2672,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2641,7 +2690,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2660,7 +2709,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2670,8 +2739,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2698,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2743,7 +2812,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2761,7 +2830,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2781,8 +2850,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2799,8 +2868,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2814,8 +2901,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2842,7 +2929,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2938,7 +3025,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2956,8 +3043,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2973,7 +3060,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2995,7 +3082,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3005,11 +3112,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3022,7 +3129,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3092,8 +3199,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3109,7 +3216,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -3131,7 +3238,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3141,10 +3268,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3157,7 +3284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3237,7 +3364,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -3257,7 +3384,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -3277,7 +3404,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3287,8 +3434,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -3303,7 +3450,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3346,7 +3493,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3519,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -3393,7 +3540,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -3411,8 +3558,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -3426,8 +3591,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -3454,7 +3619,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3511,7 +3676,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3531,7 +3696,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3561,8 +3726,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3606,7 +3771,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3628,7 +3793,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3638,9 +3823,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3653,7 +3838,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3718,7 +3903,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3736,7 +3921,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3754,7 +3939,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3773,7 +3958,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3783,9 +3988,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3800,7 +4005,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3855,7 +4060,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3873,7 +4078,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3891,7 +4096,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3911,7 +4116,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3929,8 +4134,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3944,9 +4167,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3973,7 +4196,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4055,7 +4278,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -4073,7 +4296,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -4091,7 +4314,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -4110,7 +4333,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4120,9 +4363,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -4149,7 +4392,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4195,7 +4438,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -4213,7 +4456,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -4231,8 +4474,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4248,7 +4491,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -4270,7 +4513,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4280,12 +4543,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -4298,7 +4561,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4371,7 +4634,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -4389,7 +4652,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -4407,7 +4670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -4426,7 +4689,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4436,9 +4719,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -4453,7 +4736,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4506,7 +4789,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -4524,7 +4807,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -4542,7 +4825,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -4562,7 +4845,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4580,8 +4863,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4595,9 +4896,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4624,7 +4925,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4700,7 +5001,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4718,7 +5019,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4736,7 +5037,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4755,7 +5056,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4765,9 +5086,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4794,7 +5115,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4840,7 +5161,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4858,7 +5179,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4876,8 +5197,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4893,7 +5214,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4915,7 +5236,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4925,12 +5266,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4943,7 +5284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -5014,7 +5355,27 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -5025,7 +5386,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -5038,7 +5399,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000260-test-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000260-test-post-simplified.yaml
index eadbab8..2cbff5f 100644
--- a/test/scenarios/managed-network/output/clicommon-000260-test-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000260-test-post-simplified.yaml
@@ -38,6 +38,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -75,6 +80,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
                 cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: ManagedNetwork
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -106,6 +116,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -143,6 +158,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: ManagedNetworkUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -179,6 +199,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: ListBySubscription
           cli:
             cliKey: ListBySubscription
@@ -210,6 +235,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: ScopeAssignments
       cli:
         name: ScopeAssignment
@@ -243,6 +273,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -275,6 +310,11 @@ operationGroups:
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: ScopeAssignment
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -322,6 +362,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkGroups
       cli:
         name: ManagedNetworkGroup
@@ -365,6 +410,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -407,6 +457,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: ManagedNetworkGroup
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -443,6 +498,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -484,6 +544,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkPeeringPolicies
       cli:
         name: ManagedNetworkPeeringPolicy
@@ -527,6 +592,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -569,6 +639,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: ManagedNetworkPeeringPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -605,6 +680,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -646,6 +726,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: Operations
       cli:
         name: Operation
@@ -669,6 +754,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000260-test-post.yaml b/test/scenarios/managed-network/output/clicommon-000260-test-post.yaml
index da58cb9..94a8c9e 100644
--- a/test/scenarios/managed-network/output/clicommon-000260-test-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000260-test-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -410,11 +410,23 @@ schemas:
           name: ApiVersion20190601Preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -428,7 +440,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ManagedNetworkUpdateTags
@@ -1617,7 +1628,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1672,7 +1683,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
           cliPath: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1712,7 +1723,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
           cliPath: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1781,7 +1792,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1848,7 +1859,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
           cliPath: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1915,7 +1926,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1982,7 +1993,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -2288,7 +2299,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -2306,7 +2317,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -2325,7 +2336,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2335,8 +2366,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -2351,7 +2382,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2416,7 +2447,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2434,7 +2465,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2454,7 +2485,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2472,8 +2503,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2487,8 +2536,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2515,7 +2564,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2623,7 +2672,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2641,7 +2690,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2660,7 +2709,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2670,8 +2739,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2698,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2743,7 +2812,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2761,7 +2830,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2781,8 +2850,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2799,8 +2868,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2814,8 +2901,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2842,7 +2929,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2938,7 +3025,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2956,8 +3043,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2973,7 +3060,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2995,7 +3082,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3005,11 +3112,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3022,7 +3129,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3092,8 +3199,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3109,7 +3216,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -3131,7 +3238,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3141,10 +3268,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3157,7 +3284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3237,7 +3364,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -3257,7 +3384,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -3277,7 +3404,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3287,8 +3434,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -3303,7 +3450,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3346,7 +3493,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3519,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -3393,7 +3540,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -3411,8 +3558,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -3426,8 +3591,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -3454,7 +3619,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3511,7 +3676,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3531,7 +3696,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3561,8 +3726,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3606,7 +3771,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3628,7 +3793,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3638,9 +3823,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3653,7 +3838,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3718,7 +3903,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3736,7 +3921,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3754,7 +3939,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3773,7 +3958,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3783,9 +3988,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3800,7 +4005,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3855,7 +4060,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3873,7 +4078,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3891,7 +4096,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3911,7 +4116,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3929,8 +4134,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3944,9 +4167,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3973,7 +4196,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4055,7 +4278,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -4073,7 +4296,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -4091,7 +4314,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -4110,7 +4333,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4120,9 +4363,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -4149,7 +4392,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4195,7 +4438,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -4213,7 +4456,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -4231,8 +4474,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4248,7 +4491,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -4270,7 +4513,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4280,12 +4543,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -4298,7 +4561,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4371,7 +4634,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -4389,7 +4652,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -4407,7 +4670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -4426,7 +4689,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4436,9 +4719,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -4453,7 +4736,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4506,7 +4789,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -4524,7 +4807,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -4542,7 +4825,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -4562,7 +4845,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4580,8 +4863,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4595,9 +4896,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4624,7 +4925,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4700,7 +5001,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4718,7 +5019,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4736,7 +5037,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4755,7 +5056,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4765,9 +5086,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4794,7 +5115,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4840,7 +5161,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4858,7 +5179,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4876,8 +5197,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4893,7 +5214,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4915,7 +5236,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4925,12 +5266,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4943,7 +5284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -5014,7 +5355,27 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -5025,7 +5386,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -5038,7 +5399,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000270-complex-marker-pre-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000270-complex-marker-pre-simplified.yaml
index eadbab8..2cbff5f 100644
--- a/test/scenarios/managed-network/output/clicommon-000270-complex-marker-pre-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000270-complex-marker-pre-simplified.yaml
@@ -38,6 +38,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -75,6 +80,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
                 cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: ManagedNetwork
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -106,6 +116,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -143,6 +158,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: ManagedNetworkUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -179,6 +199,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: ListBySubscription
           cli:
             cliKey: ListBySubscription
@@ -210,6 +235,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: ScopeAssignments
       cli:
         name: ScopeAssignment
@@ -243,6 +273,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -275,6 +310,11 @@ operationGroups:
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: ScopeAssignment
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -322,6 +362,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkGroups
       cli:
         name: ManagedNetworkGroup
@@ -365,6 +410,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -407,6 +457,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: ManagedNetworkGroup
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -443,6 +498,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -484,6 +544,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkPeeringPolicies
       cli:
         name: ManagedNetworkPeeringPolicy
@@ -527,6 +592,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -569,6 +639,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: ManagedNetworkPeeringPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -605,6 +680,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -646,6 +726,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: Operations
       cli:
         name: Operation
@@ -669,6 +754,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000270-complex-marker-pre.yaml b/test/scenarios/managed-network/output/clicommon-000270-complex-marker-pre.yaml
index da58cb9..94a8c9e 100644
--- a/test/scenarios/managed-network/output/clicommon-000270-complex-marker-pre.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000270-complex-marker-pre.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -410,11 +410,23 @@ schemas:
           name: ApiVersion20190601Preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -428,7 +440,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ManagedNetworkUpdateTags
@@ -1617,7 +1628,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1672,7 +1683,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
           cliPath: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1712,7 +1723,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
           cliPath: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1781,7 +1792,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1848,7 +1859,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
           cliPath: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1915,7 +1926,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1982,7 +1993,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -2288,7 +2299,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -2306,7 +2317,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -2325,7 +2336,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2335,8 +2366,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -2351,7 +2382,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2416,7 +2447,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2434,7 +2465,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2454,7 +2485,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2472,8 +2503,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2487,8 +2536,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2515,7 +2564,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2623,7 +2672,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2641,7 +2690,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2660,7 +2709,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2670,8 +2739,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2698,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2743,7 +2812,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2761,7 +2830,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2781,8 +2850,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2799,8 +2868,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2814,8 +2901,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2842,7 +2929,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2938,7 +3025,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2956,8 +3043,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2973,7 +3060,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2995,7 +3082,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3005,11 +3112,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3022,7 +3129,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3092,8 +3199,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3109,7 +3216,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -3131,7 +3238,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3141,10 +3268,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3157,7 +3284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3237,7 +3364,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -3257,7 +3384,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -3277,7 +3404,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3287,8 +3434,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -3303,7 +3450,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3346,7 +3493,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3519,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -3393,7 +3540,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -3411,8 +3558,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -3426,8 +3591,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -3454,7 +3619,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3511,7 +3676,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3531,7 +3696,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3561,8 +3726,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3606,7 +3771,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3628,7 +3793,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3638,9 +3823,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3653,7 +3838,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3718,7 +3903,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3736,7 +3921,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3754,7 +3939,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3773,7 +3958,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3783,9 +3988,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3800,7 +4005,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3855,7 +4060,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3873,7 +4078,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3891,7 +4096,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3911,7 +4116,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3929,8 +4134,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3944,9 +4167,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3973,7 +4196,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4055,7 +4278,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -4073,7 +4296,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -4091,7 +4314,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -4110,7 +4333,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4120,9 +4363,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -4149,7 +4392,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4195,7 +4438,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -4213,7 +4456,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -4231,8 +4474,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4248,7 +4491,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -4270,7 +4513,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4280,12 +4543,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -4298,7 +4561,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4371,7 +4634,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -4389,7 +4652,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -4407,7 +4670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -4426,7 +4689,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4436,9 +4719,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -4453,7 +4736,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4506,7 +4789,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -4524,7 +4807,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -4542,7 +4825,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -4562,7 +4845,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4580,8 +4863,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4595,9 +4896,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4624,7 +4925,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4700,7 +5001,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4718,7 +5019,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4736,7 +5037,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4755,7 +5056,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4765,9 +5086,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4794,7 +5115,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4840,7 +5161,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4858,7 +5179,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4876,8 +5197,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4893,7 +5214,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4915,7 +5236,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4925,12 +5266,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4943,7 +5284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -5014,7 +5355,27 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -5025,7 +5386,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -5038,7 +5399,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
diff --git a/test/scenarios/managed-network/output/clicommon-000280-complex-marker-post-simplified.yaml b/test/scenarios/managed-network/output/clicommon-000280-complex-marker-post-simplified.yaml
index aba94d7..cc7e913 100644
--- a/test/scenarios/managed-network/output/clicommon-000280-complex-marker-post-simplified.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000280-complex-marker-post-simplified.yaml
@@ -38,6 +38,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['GetModify']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -75,6 +80,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
                 cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetwork']
               bodySchema: ManagedNetwork
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -106,6 +116,11 @@ operationGroups:
                 cliKey: managedNetworkName
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$parameters['managedNetworkName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: Update
           cli:
             cliKey: Update
@@ -143,6 +158,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['parameters']
               bodySchema: ManagedNetworkUpdate
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['Update']$$requests[0]$$parameters['accept']
         - operationName: ListByResourceGroup
           cli:
             cliKey: ListByResourceGroup
@@ -179,6 +199,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListByResourceGroup']$$requests[0]$$parameters['accept']
         - operationName: ListBySubscription
           cli:
             cliKey: ListBySubscription
@@ -210,6 +235,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworks']$$operations['ListBySubscription']$$requests[0]$$parameters['accept']
     - operationGroupName: ScopeAssignments
       cli:
         name: ScopeAssignment
@@ -243,6 +273,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -275,6 +310,11 @@ operationGroups:
                 cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
                 cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['parameters']
               bodySchema: ScopeAssignment
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -322,6 +362,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ScopeAssignments']$$operations['List']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkGroups
       cli:
         name: ManagedNetworkGroup
@@ -365,6 +410,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -407,6 +457,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkGroup']
               bodySchema: ManagedNetworkGroup
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -443,6 +498,11 @@ operationGroups:
                 cliKey: managedNetworkGroupName
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$parameters['managedNetworkGroupName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -484,6 +544,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkGroups']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: ManagedNetworkPeeringPolicies
       cli:
         name: ManagedNetworkPeeringPolicy
@@ -527,6 +592,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Get']$$requests[0]$$parameters['accept']
         - operationName: CreateOrUpdate
           cli:
             cliKey: CreateOrUpdate
@@ -569,6 +639,11 @@ operationGroups:
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['managedNetworkPolicy']
               bodySchema: ManagedNetworkPeeringPolicy
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['CreateOrUpdate']$$requests[0]$$parameters['accept']
         - operationName: Delete
           cli:
             cliKey: Delete
@@ -605,6 +680,11 @@ operationGroups:
                 cliKey: managedNetworkPeeringPolicyName
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$parameters['managedNetworkPeeringPolicyName']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['Delete']$$requests[0]$$parameters['accept']
         - operationName: ListByManagedNetwork
           cli:
             cliKey: ListByManagedNetwork
@@ -646,6 +726,11 @@ operationGroups:
                 cliKey: $skiptoken
                 cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
                 cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$parameters['$skiptoken']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['ManagedNetworkPeeringPolicies']$$operations['ListByManagedNetwork']$$requests[0]$$parameters['accept']
     - operationGroupName: Operations
       cli:
         name: Operation
@@ -669,6 +754,11 @@ operationGroups:
                 cliKey: ApiVersion
                 cliM4Path: globalParameters['ApiVersion']
                 cliPath: globalParameters['ApiVersion']
+            - parameterName[0]: Accept(Accept^constant)
+              cli:
+                cliKey: accept
+                cliM4Path: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
+                cliPath: operationGroups['Operations']$$operations['List']$$requests[0]$$parameters['accept']
 schemas:
   objects:
     all:
diff --git a/test/scenarios/managed-network/output/clicommon-000280-complex-marker-post.yaml b/test/scenarios/managed-network/output/clicommon-000280-complex-marker-post.yaml
index da58cb9..94a8c9e 100644
--- a/test/scenarios/managed-network/output/clicommon-000280-complex-marker-post.yaml
+++ b/test/scenarios/managed-network/output/clicommon-000280-complex-marker-post.yaml
@@ -7,7 +7,7 @@ info:
     cli-dump-index: 30
 schemas:
   numbers:
-    - &ref_78
+    - &ref_79
       type: integer
       apiVersions:
         - version: 2019-06-01-preview
@@ -410,11 +410,23 @@ schemas:
           name: ApiVersion20190601Preview
           description: Api Version (2019-06-01-preview)
       protocol: {}
+    - &ref_66
+      type: constant
+      value:
+        value: application/json
+      valueType: *ref_0
+      language:
+        default:
+          name: Accept
+          description: 'Accept: application/json'
+        cli:
+          name: Accept
+          description: 'Accept: application/json'
+      protocol: {}
   dictionaries:
     - &ref_28
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: TrackedResourceTags
@@ -428,7 +440,6 @@ schemas:
     - &ref_33
       type: dictionary
       elementType: *ref_1
-      nullableItems: false
       language:
         default:
           name: ManagedNetworkUpdateTags
@@ -1617,7 +1628,7 @@ schemas:
     - *ref_20
     - *ref_5
     - *ref_21
-    - &ref_68
+    - &ref_69
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1672,7 +1683,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ErrorResponse'']'
           cliPath: 'schemas$$objects[''ErrorResponse'']'
       protocol: {}
-    - &ref_74
+    - &ref_75
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1712,7 +1723,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkUpdate'']'
           cliPath: 'schemas$$objects[''ManagedNetworkUpdate'']'
       protocol: {}
-    - &ref_82
+    - &ref_83
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1781,7 +1792,7 @@ schemas:
       protocol: {}
     - *ref_22
     - *ref_16
-    - &ref_93
+    - &ref_94
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1848,7 +1859,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ScopeAssignmentListResult'']'
           cliPath: 'schemas$$objects[''ScopeAssignmentListResult'']'
       protocol: {}
-    - &ref_108
+    - &ref_109
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1915,7 +1926,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkGroupListResult'']'
       protocol: {}
-    - &ref_123
+    - &ref_124
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -1982,7 +1993,7 @@ schemas:
           cliM4Path: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
           cliPath: 'schemas$$objects[''ManagedNetworkPeeringPolicyListResult'']'
       protocol: {}
-    - &ref_124
+    - &ref_125
       type: object
       apiVersions:
         - version: 2019-06-01-preview
@@ -2288,7 +2299,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_66
+          - &ref_67
             schema: *ref_1
             implementation: Method
             required: true
@@ -2306,7 +2317,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_67
+          - &ref_68
             schema: *ref_1
             implementation: Method
             required: true
@@ -2325,7 +2336,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''GetModify'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2335,8 +2366,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_66
           - *ref_67
+          - *ref_68
         responses:
           - schema: *ref_2
             language:
@@ -2351,7 +2382,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2416,7 +2447,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_70
+          - &ref_71
             schema: *ref_1
             implementation: Method
             required: true
@@ -2434,7 +2465,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_71
+          - &ref_72
             schema: *ref_1
             implementation: Method
             required: true
@@ -2454,7 +2485,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_69
+              - &ref_70
                 schema: *ref_2
                 implementation: Method
                 required: true
@@ -2472,8 +2503,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_69
+              - *ref_70
             language:
               default:
                 name: ''
@@ -2487,8 +2536,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_70
           - *ref_71
+          - *ref_72
         responses:
           - schema: *ref_2
             language:
@@ -2515,7 +2564,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2623,7 +2672,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_72
+          - &ref_73
             schema: *ref_1
             implementation: Method
             required: true
@@ -2641,7 +2690,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_73
+          - &ref_74
             schema: *ref_1
             implementation: Method
             required: true
@@ -2660,7 +2709,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -2670,8 +2739,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_72
           - *ref_73
+          - *ref_74
         responses:
           - language:
               default:
@@ -2698,7 +2767,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2743,7 +2812,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_76
+          - &ref_77
             schema: *ref_1
             implementation: Method
             required: true
@@ -2761,7 +2830,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_77
+          - &ref_78
             schema: *ref_1
             implementation: Method
             required: true
@@ -2781,8 +2850,8 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_75
-                schema: *ref_74
+              - &ref_76
+                schema: *ref_75
                 implementation: Method
                 required: true
                 language:
@@ -2799,8 +2868,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''Update'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_75
+              - *ref_76
             language:
               default:
                 name: ''
@@ -2814,8 +2901,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_76
           - *ref_77
+          - *ref_78
         responses:
           - schema: *ref_2
             language:
@@ -2842,7 +2929,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -2938,7 +3025,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_79
+          - &ref_80
             schema: *ref_1
             implementation: Method
             required: true
@@ -2956,8 +3043,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_80
-            schema: *ref_78
+          - &ref_81
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -2973,7 +3060,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_81
+          - &ref_82
             schema: *ref_1
             implementation: Method
             language:
@@ -2995,7 +3082,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListByResourceGroup'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3005,11 +3112,11 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_79
           - *ref_80
           - *ref_81
+          - *ref_82
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3022,7 +3129,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3092,8 +3199,8 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_83
-            schema: *ref_78
+          - &ref_84
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -3109,7 +3216,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_84
+          - &ref_85
             schema: *ref_1
             implementation: Method
             language:
@@ -3131,7 +3238,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworks'']$$operations[''ListBySubscription'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3141,10 +3268,10 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_83
           - *ref_84
+          - *ref_85
         responses:
-          - schema: *ref_82
+          - schema: *ref_83
             language:
               default:
                 name: ''
@@ -3157,7 +3284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3237,7 +3364,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_85
+          - &ref_86
             schema: *ref_1
             implementation: Method
             required: true
@@ -3257,7 +3384,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_86
+          - &ref_87
             schema: *ref_1
             implementation: Method
             required: true
@@ -3277,7 +3404,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3287,8 +3434,8 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_85
           - *ref_86
+          - *ref_87
         responses:
           - schema: *ref_22
             language:
@@ -3303,7 +3450,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3346,7 +3493,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_88
+          - &ref_89
             schema: *ref_1
             implementation: Method
             required: true
@@ -3372,7 +3519,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_89
+          - &ref_90
             schema: *ref_1
             implementation: Method
             required: true
@@ -3393,7 +3540,7 @@ operationGroups:
           - *ref_64
         requests:
           - parameters:
-              - &ref_87
+              - &ref_88
                 schema: *ref_22
                 implementation: Method
                 required: true
@@ -3411,8 +3558,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_87
+              - *ref_88
             language:
               default:
                 name: ''
@@ -3426,8 +3591,8 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_88
           - *ref_89
+          - *ref_90
         responses:
           - schema: *ref_22
             language:
@@ -3454,7 +3619,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3511,7 +3676,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_90
+          - &ref_91
             schema: *ref_1
             implementation: Method
             required: true
@@ -3531,7 +3696,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_91
+          - &ref_92
             schema: *ref_1
             implementation: Method
             required: true
@@ -3561,8 +3726,8 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_90
           - *ref_91
+          - *ref_92
         responses:
           - language:
               default:
@@ -3606,7 +3771,7 @@ operationGroups:
           - version: 2019-06-01-preview
         parameters:
           - *ref_63
-          - &ref_92
+          - &ref_93
             schema: *ref_1
             implementation: Method
             required: true
@@ -3628,7 +3793,27 @@ operationGroups:
                 in: path
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ScopeAssignments'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3638,9 +3823,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_92
+          - *ref_93
         responses:
-          - schema: *ref_93
+          - schema: *ref_94
             language:
               default:
                 name: ''
@@ -3653,7 +3838,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3718,7 +3903,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_94
+          - &ref_95
             schema: *ref_1
             implementation: Method
             required: true
@@ -3736,7 +3921,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_95
+          - &ref_96
             schema: *ref_1
             implementation: Method
             required: true
@@ -3754,7 +3939,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_96
+          - &ref_97
             schema: *ref_1
             implementation: Method
             required: true
@@ -3773,7 +3958,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -3783,9 +3988,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_94
           - *ref_95
           - *ref_96
+          - *ref_97
         responses:
           - schema: *ref_13
             language:
@@ -3800,7 +4005,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -3855,7 +4060,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_98
+          - &ref_99
             schema: *ref_1
             implementation: Method
             required: true
@@ -3873,7 +4078,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_99
+          - &ref_100
             schema: *ref_1
             implementation: Method
             required: true
@@ -3891,7 +4096,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_100
+          - &ref_101
             schema: *ref_1
             implementation: Method
             required: true
@@ -3911,7 +4116,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_97
+              - &ref_98
                 schema: *ref_13
                 implementation: Method
                 required: true
@@ -3929,8 +4134,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_97
+              - *ref_98
             language:
               default:
                 name: ''
@@ -3944,9 +4167,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_98
           - *ref_99
           - *ref_100
+          - *ref_101
         responses:
           - schema: *ref_13
             language:
@@ -3973,7 +4196,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4055,7 +4278,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_101
+          - &ref_102
             schema: *ref_1
             implementation: Method
             required: true
@@ -4073,7 +4296,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_102
+          - &ref_103
             schema: *ref_1
             implementation: Method
             required: true
@@ -4091,7 +4314,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_103
+          - &ref_104
             schema: *ref_1
             implementation: Method
             required: true
@@ -4110,7 +4333,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4120,9 +4363,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_101
           - *ref_102
           - *ref_103
+          - *ref_104
         responses:
           - language:
               default:
@@ -4149,7 +4392,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4195,7 +4438,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_104
+          - &ref_105
             schema: *ref_1
             implementation: Method
             required: true
@@ -4213,7 +4456,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_105
+          - &ref_106
             schema: *ref_1
             implementation: Method
             required: true
@@ -4231,8 +4474,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_106
-            schema: *ref_78
+          - &ref_107
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4248,7 +4491,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_107
+          - &ref_108
             schema: *ref_1
             implementation: Method
             language:
@@ -4270,7 +4513,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkGroups'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4280,12 +4543,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_104
           - *ref_105
           - *ref_106
           - *ref_107
+          - *ref_108
         responses:
-          - schema: *ref_108
+          - schema: *ref_109
             language:
               default:
                 name: ''
@@ -4298,7 +4561,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4371,7 +4634,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_109
+          - &ref_110
             schema: *ref_1
             implementation: Method
             required: true
@@ -4389,7 +4652,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_110
+          - &ref_111
             schema: *ref_1
             implementation: Method
             required: true
@@ -4407,7 +4670,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_111
+          - &ref_112
             schema: *ref_1
             implementation: Method
             required: true
@@ -4426,7 +4689,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Get'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4436,9 +4719,9 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_109
           - *ref_110
           - *ref_111
+          - *ref_112
         responses:
           - schema: *ref_20
             language:
@@ -4453,7 +4736,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4506,7 +4789,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_113
+          - &ref_114
             schema: *ref_1
             implementation: Method
             required: true
@@ -4524,7 +4807,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_114
+          - &ref_115
             schema: *ref_1
             implementation: Method
             required: true
@@ -4542,7 +4825,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_115
+          - &ref_116
             schema: *ref_1
             implementation: Method
             required: true
@@ -4562,7 +4845,7 @@ operationGroups:
                 in: path
         requests:
           - parameters:
-              - &ref_112
+              - &ref_113
                 schema: *ref_20
                 implementation: Method
                 required: true
@@ -4580,8 +4863,26 @@ operationGroups:
                   http:
                     in: body
                     style: json
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''CreateOrUpdate'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
             signatureParameters:
-              - *ref_112
+              - *ref_113
             language:
               default:
                 name: ''
@@ -4595,9 +4896,9 @@ operationGroups:
                   - application/json
                 uri: '{$host}'
         signatureParameters:
-          - *ref_113
           - *ref_114
           - *ref_115
+          - *ref_116
         responses:
           - schema: *ref_20
             language:
@@ -4624,7 +4925,7 @@ operationGroups:
                 statusCodes:
                   - '201'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4700,7 +5001,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_116
+          - &ref_117
             schema: *ref_1
             implementation: Method
             required: true
@@ -4718,7 +5019,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_117
+          - &ref_118
             schema: *ref_1
             implementation: Method
             required: true
@@ -4736,7 +5037,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_118
+          - &ref_119
             schema: *ref_1
             implementation: Method
             required: true
@@ -4755,7 +5056,27 @@ operationGroups:
               http:
                 in: path
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''Delete'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4765,9 +5086,9 @@ operationGroups:
                 method: delete
                 uri: '{$host}'
         signatureParameters:
-          - *ref_116
           - *ref_117
           - *ref_118
+          - *ref_119
         responses:
           - language:
               default:
@@ -4794,7 +5115,7 @@ operationGroups:
                 statusCodes:
                   - '204'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -4840,7 +5161,7 @@ operationGroups:
           - *ref_63
           - *ref_64
           - *ref_65
-          - &ref_119
+          - &ref_120
             schema: *ref_1
             implementation: Method
             required: true
@@ -4858,7 +5179,7 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_120
+          - &ref_121
             schema: *ref_1
             implementation: Method
             required: true
@@ -4876,8 +5197,8 @@ operationGroups:
             protocol:
               http:
                 in: path
-          - &ref_121
-            schema: *ref_78
+          - &ref_122
+            schema: *ref_79
             implementation: Method
             language:
               default:
@@ -4893,7 +5214,7 @@ operationGroups:
             protocol:
               http:
                 in: query
-          - &ref_122
+          - &ref_123
             schema: *ref_1
             implementation: Method
             language:
@@ -4915,7 +5236,27 @@ operationGroups:
               http:
                 in: query
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''ManagedNetworkPeeringPolicies'']$$operations[''ListByManagedNetwork'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -4925,12 +5266,12 @@ operationGroups:
                 method: get
                 uri: '{$host}'
         signatureParameters:
-          - *ref_119
           - *ref_120
           - *ref_121
           - *ref_122
+          - *ref_123
         responses:
-          - schema: *ref_123
+          - schema: *ref_124
             language:
               default:
                 name: ''
@@ -4943,7 +5284,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''
@@ -5014,7 +5355,27 @@ operationGroups:
           - *ref_63
           - *ref_64
         requests:
-          - language:
+          - parameters:
+              - schema: *ref_66
+                implementation: Method
+                origin: 'modelerfour:synthesized/accept'
+                required: true
+                language:
+                  default:
+                    name: Accept
+                    description: Accept header
+                    serializedName: Accept
+                  cli:
+                    name: Accept
+                    description: Accept header
+                    cliKey: accept
+                    cliM4Path: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                    cliPath: 'operationGroups[''Operations'']$$operations[''List'']$$requests[0]$$parameters[''accept'']'
+                protocol:
+                  http:
+                    in: header
+            signatureParameters: []
+            language:
               default:
                 name: ''
                 description: ''
@@ -5025,7 +5386,7 @@ operationGroups:
                 uri: '{$host}'
         signatureParameters: []
         responses:
-          - schema: *ref_124
+          - schema: *ref_125
             language:
               default:
                 name: ''
@@ -5038,7 +5399,7 @@ operationGroups:
                 statusCodes:
                   - '200'
         exceptions:
-          - schema: *ref_68
+          - schema: *ref_69
             language:
               default:
                 name: ''