diff --git a/e2e/scripts/mockTests.ts b/e2e/scripts/mockTests.ts
index cc3f69e6..0fb4e654 100644
--- a/e2e/scripts/mockTests.ts
+++ b/e2e/scripts/mockTests.ts
@@ -1,5 +1,6 @@
 import { execSync } from 'child_process'
 import { readTestInfo } from '../shared/testInfo'
+import pkg from '../../package.json'
 
 async function main() {
   let hasError = false
@@ -16,13 +17,19 @@ async function main() {
     const resultPath = `${info.routePrefix}/${info.getResultPath}`
     const host = info.functionAppUrl
 
+    const agentUrl = new URL(host)
+    agentUrl.pathname = agentPath
+
+    const resultUrl = new URL(host)
+    resultUrl.pathname = resultPath
+
     console.info('Running mock server for', host)
     console.info('Agent download path:', agentPath)
     console.info('Get result path:', resultPath)
 
     try {
       execSync(
-        `npm exec -y "git+https://github.com/fingerprintjs/dx-team-mock-for-proxy-integrations-e2e-tests.git" -- --api-url="https://${apiUrl}" --host="${host}" --cdn-proxy-path="${agentPath}" --ingress-proxy-path="${resultPath}"`,
+        `npm exec -y "git+https://github.com/fingerprintjs/dx-team-mock-for-proxy-integrations-e2e-tests.git" -- --api-url="https://${apiUrl}" --cdn-proxy-url="${agentUrl.toString()}" --ingress-proxy-url="${resultUrl.toString()}" --traffic-name="fingerprint-pro-azure" --integration-version=${pkg.version}`,
         {
           stdio: 'inherit',
         }
diff --git a/proxy/handlers/agent.test.ts b/proxy/handlers/agent.test.ts
index 7da233d2..d105050a 100644
--- a/proxy/handlers/agent.test.ts
+++ b/proxy/handlers/agent.test.ts
@@ -64,6 +64,23 @@ describe('Agent Endpoint', () => {
     })
   })
 
+  test('Call with custom query parameters', async () => {
+    const req = mockRequestGet('https://fp.domain.com', 'fpjs/agent', {
+      apiKey: 'ujKG34hUYKLJKJ1F',
+      version: '5',
+      customQuery: '123',
+    })
+    const ctx = mockContext(req)
+
+    await proxy(ctx, req)
+
+    const [url] = requestSpy.mock.calls[0]
+
+    expect(url.toString()).toEqual(
+      `https://${origin}/v5/ujKG34hUYKLJKJ1F?apiKey=ujKG34hUYKLJKJ1F&version=5&customQuery=123&ii=fingerprint-pro-azure%2F__azure_function_version__%2Fprocdn`
+    )
+  })
+
   test('Call with version', async () => {
     const req = mockRequestGet('https://fp.domain.com', 'fpjs/agent', {
       apiKey: 'ujKG34hUYKLJKJ1F',
@@ -76,7 +93,7 @@ describe('Agent Endpoint', () => {
     const [url] = requestSpy.mock.calls[0]
 
     expect(url.toString()).toEqual(
-      `https://${origin}/v5/ujKG34hUYKLJKJ1F?ii=fingerprint-pro-azure%2F__azure_function_version__%2Fprocdn`
+      `https://${origin}/v5/ujKG34hUYKLJKJ1F?apiKey=ujKG34hUYKLJKJ1F&version=5&ii=fingerprint-pro-azure%2F__azure_function_version__%2Fprocdn`
     )
   })
 
@@ -93,7 +110,7 @@ describe('Agent Endpoint', () => {
     const [url] = requestSpy.mock.calls[0]
 
     expect(url.toString()).toEqual(
-      `https://${origin}/v5/ujKG34hUYKLJKJ1F/loader_v3.6.5.js?ii=fingerprint-pro-azure%2F__azure_function_version__%2Fprocdn`
+      `https://${origin}/v5/ujKG34hUYKLJKJ1F/loader_v3.6.5.js?apiKey=ujKG34hUYKLJKJ1F&version=5&loaderVersion=3.6.5&ii=fingerprint-pro-azure%2F__azure_function_version__%2Fprocdn`
     )
   })
 
@@ -214,7 +231,7 @@ describe('Agent Endpoint', () => {
     })
   })
 
-  test('Req body and headers are the same, expect cookies, which should include only _iidt cookie', async () => {
+  test('Req body and headers are the same, expect cookies, which should be omitted', async () => {
     const req = mockRequestGet('https://fp.domain.com', 'fpjs/agent', {
       apiKey: 'ujKG34hUYKLJKJ1F',
       version: '5',
@@ -242,7 +259,7 @@ describe('Agent Endpoint', () => {
 
     expect(options.headers).toEqual({
       ...req.headers,
-      cookie: '_iidt=GlMQaHMfzYvomxCuA7Uymy7ArmjH04jPkT+enN7j/Xk8tJG+UYcQV+Qw60Ry4huw9bmDoO/smyjQp5vLCuSf8t4Jow==',
+      cookie: undefined,
     })
   })
 
diff --git a/proxy/handlers/agent.ts b/proxy/handlers/agent.ts
index 63cfd5aa..2f6e290c 100644
--- a/proxy/handlers/agent.ts
+++ b/proxy/handlers/agent.ts
@@ -2,7 +2,7 @@ import { HttpRequest, Logger } from '@azure/functions'
 import { config } from '../utils/config'
 import * as https from 'https'
 import { filterRequestHeaders, updateResponseHeadersForAgentDownload } from '../utils/headers'
-import { HttpResponseSimple } from '@azure/functions/types/http'
+import { HttpRequestQuery, HttpResponseSimple } from '@azure/functions/types/http'
 import { addTrafficMonitoringSearchParamsForProCDN } from '../utils/traffic'
 import { IntegrationError } from '../errors/IntegrationError'
 
@@ -14,6 +14,12 @@ export interface DownloadAgentParams {
 
 const DEFAULT_VERSION = '3'
 
+function copySearchParams(query: HttpRequestQuery, newURL: URL): void {
+  const params = new URLSearchParams(query)
+
+  newURL.search = params.toString()
+}
+
 export async function downloadAgent({ httpRequest, logger, path }: DownloadAgentParams): Promise<HttpResponseSimple> {
   const apiKey = httpRequest.query.apiKey
   const version = httpRequest.query.version ?? DEFAULT_VERSION
@@ -30,6 +36,8 @@ export async function downloadAgent({ httpRequest, logger, path }: DownloadAgent
   }
 
   const url = new URL(`https://${config.fpcdn}`)
+  copySearchParams(httpRequest.query, url)
+
   url.pathname = getEndpoint(apiKey, version, loaderVersion)
   addTrafficMonitoringSearchParamsForProCDN(url)
 
@@ -37,6 +45,8 @@ export async function downloadAgent({ httpRequest, logger, path }: DownloadAgent
 
   const headers = filterRequestHeaders(httpRequest.headers)
 
+  delete headers['cookie']
+
   return new Promise<HttpResponseSimple>((resolve) => {
     const data: any[] = []
 
diff --git a/proxy/handlers/ingress.test.ts b/proxy/handlers/ingress.test.ts
index c28a1396..d56c4834 100644
--- a/proxy/handlers/ingress.test.ts
+++ b/proxy/handlers/ingress.test.ts
@@ -114,6 +114,23 @@ describe('Result Endpoint', function () {
     expect(options.headers.cookie).toBe('_iidt=7A03Gwg')
   })
 
+  test('Cookies are undefined if _iidt is not est', async () => {
+    const req = mockRequestGet('https://fp.domain.com', 'fpjs/resultId')
+
+    req.headers.cookie = '_vid_t=gEFRuIQlzYmv692/UL4GLA=='
+
+    mockSuccessfulResponse({
+      checkRequestUrl: (url) => {
+        expect(url.toString()).toBe(`${defaultOrigin}/${search}`)
+      },
+    })
+
+    await proxy(mockContext(req), req)
+
+    const [, options] = requestSpy.mock.calls[0]
+    expect(options.headers.cookie).toBeFalsy()
+  })
+
   test('Request body and headers are not modified, expect strict-transport-security and transfer-encoding', async () => {
     const req = mockRequestGet('https://fp.domain.com', 'fpjs/resultId')
     const resHeaders = {
diff --git a/proxy/handlers/ingress.ts b/proxy/handlers/ingress.ts
index c1200c81..430c7699 100644
--- a/proxy/handlers/ingress.ts
+++ b/proxy/handlers/ingress.ts
@@ -42,6 +42,11 @@ export function handleIngress({
 
   const headers = prepareHeadersForIngressAPI(httpRequest, preSharedSecret, logger)
 
+  // No need to send cookies for browser cache request
+  if (suffix) {
+    delete headers['cookie']
+  }
+
   return new Promise<HttpResponseSimple>((resolve) => {
     const data: any[] = []
 
diff --git a/proxy/utils/headers.ts b/proxy/utils/headers.ts
index c51e0baa..05b3e5a6 100644
--- a/proxy/utils/headers.ts
+++ b/proxy/utils/headers.ts
@@ -21,12 +21,15 @@ export function filterRequestHeaders(headers: HttpRequestHeaders) {
       let headerValue = value
 
       if (headerName === 'cookie') {
-        headerValue = headerValue.split(/; */).join('; ')
-
         headerValue = filterCookie(headerValue, (key) => key === FPJS_COOKIE_NAME)
-      }
 
-      result[headerName] = headerValue
+        // Only set cookie header if there are relevant cookies
+        if (headerValue) {
+          result[headerName] = headerValue
+        }
+      } else {
+        result[headerName] = headerValue
+      }
     }
 
     return result