diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
index baebff25d7..3cb8d19d33 100644
--- a/.github/workflows/dart.yml
+++ b/.github/workflows/dart.yml
@@ -540,6 +540,44 @@ jobs:
       - job_006
       - job_007
   job_015:
+    name: "unit_test; linux; Dart dev; PKG: pkgs/http; `dart test --test-randomize-ordering-seed=random -p chrome -c dart2wasm`"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cache Pub hosted dependencies
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84
+        with:
+          path: "~/.pub-cache/hosted"
+          key: "os:ubuntu-latest;pub-cache-hosted;sdk:dev;packages:pkgs/http;commands:test_4"
+          restore-keys: |
+            os:ubuntu-latest;pub-cache-hosted;sdk:dev;packages:pkgs/http
+            os:ubuntu-latest;pub-cache-hosted;sdk:dev
+            os:ubuntu-latest;pub-cache-hosted
+            os:ubuntu-latest
+      - name: Setup Dart SDK
+        uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d
+        with:
+          sdk: dev
+      - id: checkout
+        name: Checkout repository
+        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
+      - id: pkgs_http_pub_upgrade
+        name: pkgs/http; dart pub upgrade
+        run: dart pub upgrade
+        if: "always() && steps.checkout.conclusion == 'success'"
+        working-directory: pkgs/http
+      - name: "pkgs/http; dart test --test-randomize-ordering-seed=random -p chrome -c dart2wasm"
+        run: "dart test --test-randomize-ordering-seed=random -p chrome -c dart2wasm"
+        if: "always() && steps.pkgs_http_pub_upgrade.conclusion == 'success'"
+        working-directory: pkgs/http
+    needs:
+      - job_001
+      - job_002
+      - job_003
+      - job_004
+      - job_005
+      - job_006
+      - job_007
+  job_016:
     name: "unit_test; linux; Flutter stable; PKG: pkgs/flutter_http_example; `flutter test --platform chrome`"
     runs-on: ubuntu-latest
     steps:
@@ -577,7 +615,7 @@ jobs:
       - job_005
       - job_006
       - job_007
-  job_016:
+  job_017:
     name: "unit_test; linux; Flutter stable; PKG: pkgs/flutter_http_example; `flutter test`"
     runs-on: ubuntu-latest
     steps:
@@ -615,7 +653,7 @@ jobs:
       - job_005
       - job_006
       - job_007
-  job_017:
+  job_018:
     name: "unit_test; macos; Flutter stable; PKG: pkgs/flutter_http_example; `flutter test`"
     runs-on: macos-latest
     steps:
@@ -653,7 +691,7 @@ jobs:
       - job_005
       - job_006
       - job_007
-  job_018:
+  job_019:
     name: "unit_test; windows; Flutter stable; PKG: pkgs/flutter_http_example; `flutter test`"
     runs-on: windows-latest
     steps:
diff --git a/pkgs/http/CHANGELOG.md b/pkgs/http/CHANGELOG.md
index 650b3e3a2b..a6edd66e3b 100644
--- a/pkgs/http/CHANGELOG.md
+++ b/pkgs/http/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## 1.1.3-wip
 
+* Add `MockClient.pngResponse`, which makes it easier to fake image responses.
 * Add `redirects` in `IOStreamedResponse`.
 
 ## 1.1.2
diff --git a/pkgs/http/README.md b/pkgs/http/README.md
index 157a52f678..642c238035 100644
--- a/pkgs/http/README.md
+++ b/pkgs/http/README.md
@@ -124,7 +124,7 @@ Some well supported implementations are:
 | Implementation | Supported Platforms | SDK | Caching | HTTP3/QUIC | Platform Native | 
 | -------------- | ------------------- | ----| ------- | ---------- | --------------- |
 | `package:http` — [`IOClient`][ioclient] | Android, iOS, Linux, macOS, Windows | Dart, Flutter | ❌ | ❌ | ❌ |
-| `package:http` — [`BrowserClient`][browserclient] | Web | Flutter | ― | ✅︎ | ✅︎ | Dart, Flutter |
+| `package:http` — [`BrowserClient`][browserclient] | Web | Dart, Flutter | ― | ✅︎ | ✅︎ | Dart, Flutter |
 | [`package:cupertino_http`][cupertinohttp] — [`CupertinoClient`][cupertinoclient] | iOS, macOS | Flutter | ✅︎ | ✅︎ | ✅︎ |
 | [`package:cronet_http`][cronethttp] — [`CronetClient`][cronetclient] | Android | Flutter | ✅︎ | ✅︎ | ― |
 | [`package:fetch_client`][fetch] — [`FetchClient`][fetchclient] | Web | Dart, Flutter | ✅︎ | ✅︎ | ✅︎ |
diff --git a/pkgs/http/lib/src/mock_client.dart b/pkgs/http/lib/src/mock_client.dart
index bf2df40ee7..52f108a577 100644
--- a/pkgs/http/lib/src/mock_client.dart
+++ b/pkgs/http/lib/src/mock_client.dart
@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'dart:convert';
+
 import 'base_client.dart';
 import 'base_request.dart';
 import 'byte_stream.dart';
@@ -10,6 +12,11 @@ import 'response.dart';
 import 'streamed_request.dart';
 import 'streamed_response.dart';
 
+final _pngImageData = base64Decode(
+  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDw'
+  'AEhQGAhKmMIQAAAABJRU5ErkJggg==',
+);
+
 // TODO(nweiz): once Dart has some sort of Rack- or WSGI-like standard for
 // server APIs, MockClient should conform to it.
 
@@ -69,6 +76,17 @@ class MockClient extends BaseClient {
     var bodyStream = request.finalize();
     return await _handler(request, bodyStream);
   }
+
+  /// Return a response containing a PNG image.
+  static Response pngResponse({BaseRequest? request}) {
+    final headers = {
+      'content-type': 'image/png',
+      'content-length': '${_pngImageData.length}'
+    };
+
+    return Response.bytes(_pngImageData, 200,
+        request: request, headers: headers, reasonPhrase: 'OK');
+  }
 }
 
 /// A handler function that receives [StreamedRequest]s and sends
diff --git a/pkgs/http/mono_pkg.yaml b/pkgs/http/mono_pkg.yaml
index 0e2f9d8aa7..06f79d9816 100644
--- a/pkgs/http/mono_pkg.yaml
+++ b/pkgs/http/mono_pkg.yaml
@@ -18,3 +18,5 @@ stages:
   - command: dart run --define=no_default_http_client=true test/no_default_http_client_test.dart
     os:
     - linux
+  - test: --test-randomize-ordering-seed=random -p chrome -c dart2wasm
+    sdk: dev
diff --git a/pkgs/http/pubspec.yaml b/pkgs/http/pubspec.yaml
index 118292fa13..1645f96048 100644
--- a/pkgs/http/pubspec.yaml
+++ b/pkgs/http/pubspec.yaml
@@ -1,5 +1,5 @@
 name: http
-version: 1.1.2
+version: 1.1.3-wip
 description: A composable, multi-platform, Future-based API for HTTP requests.
 repository: https://github.com/dart-lang/http/tree/master/pkgs/http
 
diff --git a/pkgs/http/test/mock_client_test.dart b/pkgs/http/test/mock_client_test.dart
index db561c51d6..625285cb33 100644
--- a/pkgs/http/test/mock_client_test.dart
+++ b/pkgs/http/test/mock_client_test.dart
@@ -5,6 +5,7 @@
 import 'dart:convert';
 
 import 'package:http/http.dart' as http;
+import 'package:http/src/request.dart';
 import 'package:http/testing.dart';
 import 'package:test/test.dart';
 
@@ -43,4 +44,25 @@ void main() {
     expect(await client.read(Uri.http('example.com', '/foo')),
         equals('you did it'));
   });
+
+  test('pngResponse with default options', () {
+    final response = MockClient.pngResponse();
+    expect(response.statusCode, 200);
+    expect(response.bodyBytes.take(8),
+        [137, 80, 78, 71, 13, 10, 26, 10] // PNG header
+        );
+    expect(response.request, null);
+    expect(response.headers, containsPair('content-type', 'image/png'));
+  });
+
+  test('pngResponse with request', () {
+    final request = Request('GET', Uri.https('example.com'));
+    final response = MockClient.pngResponse(request: request);
+    expect(response.statusCode, 200);
+    expect(response.bodyBytes.take(8),
+        [137, 80, 78, 71, 13, 10, 26, 10] // PNG header
+        );
+    expect(response.request, request);
+    expect(response.headers, containsPair('content-type', 'image/png'));
+  });
 }
diff --git a/tool/ci.sh b/tool/ci.sh
index 44ea987b60..d4cc8d2ee6 100755
--- a/tool/ci.sh
+++ b/tool/ci.sh
@@ -95,6 +95,10 @@ for PKG in ${PKGS}; do
         echo 'dart test --platform chrome'
         dart test --platform chrome || EXIT_CODE=$?
         ;;
+      test_4)
+        echo 'dart test --test-randomize-ordering-seed=random -p chrome -c dart2wasm'
+        dart test --test-randomize-ordering-seed=random -p chrome -c dart2wasm || EXIT_CODE=$?
+        ;;
       *)
         echo -e "\033[31mUnknown TASK '${TASK}' - TERMINATING JOB\033[0m"
         exit 64