Disabling proxies in Flex Consumption (#10105)

Author: fabiocav

release_notes.md

@@ -11,3 +11,4 @@
 - Update PowerShell worker 7.2 to [4.0.3220](https://github.com/Azure/azure-functions-powershell-worker/releases/tag/v4.0.3220)
 - Update PowerShell worker 7.4 to [4.0.3219](https://github.com/Azure/azure-functions-powershell-worker/releases/tag/v4.0.3219)
 - Update Node.js Worker Version to [3.10.0](https://github.com/Azure/azure-functions-nodejs-worker/releases/tag/v3.10.0) (#9999)
+- Ensuring proxies are disabled, with a warning, when running in Flex Consumption. 

src/WebJobs.Script/Host/ProxyFunctionProvider.cs

@@ -41,6 +41,12 @@ public ProxyFunctionProvider(IOptions<ScriptJobHostOptions> scriptOptions, IEnvi
             _logger = loggerFactory.CreateLogger(LogCategories.Startup);
             if (_environment.IsProxiesEnabled())
             {
+                if (_environment.IsFlexConsumptionSku())
+                {
+                    _logger.LogWarning("Proxies are not supported in Flex Consumption. Proxy definitions will be ignored.");
+                    return;
+                }
+
                 // note these are both null-checked; if they're left null (disabled) - that's fine
                 _metadata = new Lazy<ImmutableArray<FunctionMetadata>>(LoadFunctionMetadata);