Support for HttpContext.RequestAborted cancellation token for Http requests (#9159)

Author: liliankasem

release_notes.md

@@ -10,6 +10,7 @@
 - Update PowerShell Worker 7.2 to 4.0.2719 [Release Note](https://github.com/Azure/azure-functions-powershell-worker/releases/tag/v4.0.2719)
 - Update Node.js Worker Version to [3.6.0](https://github.com/Azure/azure-functions-nodejs-worker/releases/tag/v3.6.0)
 - Upgrade PowerShell language worker 7.0 to 4.0.2733 [Release Note](https://github.com/Azure/azure-functions-powershell-worker/releases/tag/v4.0.2733)
+- Support for HttpContext.RequestAborted cancellation token for Http requests (#9159)
 
 **Release sprint:** Sprint 140
 [ [bugs](https://github.com/Azure/azure-functions-host/issues?q=is%3Aissue+milestone%3A%22Functions+Sprint+140%22+label%3Abug+is%3Aclosed) | [features](https://github.com/Azure/azure-functions-host/issues?q=is%3Aissue+milestone%3A%22Functions+Sprint+140%22+label%3Afeature+is%3Aclosed) ]

src/WebJobs.Script.WebHost/Middleware/FunctionInvocationMiddleware.cs

@@ -128,7 +128,8 @@ private async Task<IActionResult> GetResultAsync(HttpContext context, IFunctionE
                 using (logger.BeginScope(scopeState))
                 {
                     var applicationLifetime = context.RequestServices.GetService<IApplicationLifetime>();
-                    CancellationToken cancellationToken = applicationLifetime != null ? applicationLifetime.ApplicationStopping : CancellationToken.None;
+                    CancellationToken cancellationToken = context.RequestAborted;
+
                     await functionExecution.ExecuteAsync(context.Request, cancellationToken);
 
                     if (context.Items.TryGetValue(ScriptConstants.AzureFunctionsDuplicateHttpHeadersKey, out object value))