Merge pull request #271773 from bachuv/vabachu/df-callhttp-dotnet-isolated-updates

DF .NET Isolated HTTP API updates

Author: prmerger-automator[bot]

articles/azure-functions/durable/durable-functions-orchestrations.md

@@ -310,7 +310,25 @@ public static async Task CheckSiteAvailable(
 
 # [C# (Isolated)](#tab/csharp-isolated)
 
-The feature is not currently supported in dotnet-isolated worker. Instead, write an activity which performs the desired HTTP call.
+To simplify this common pattern, orchestrator functions can use the `CallHttpAsync` method to invoke HTTP APIs directly. For C# (Isolated), this feature was introduced in Microsoft.Azure.Functions.Worker.Extensions.DurableTask v1.1.0.
+
+```csharp
+[Function("CheckSiteAvailable")]
+public static async Task CheckSiteAvailable(
+    [OrchestrationTrigger] TaskOrchestrationContext context)
+{
+    Uri url = context.GetInput<Uri>();
+
+    // Makes an HTTP GET request to the specified endpoint
+    DurableHttpResponse response =
+        await context.CallHttpAsync(HttpMethod.Get, url);
+
+    if ((int)response.StatusCode == 400)
+    {
+        // handling of error codes goes here
+    }
+}
+```
 
 # [JavaScript (PM3)](#tab/javascript-v3)