netstandard2 extendable lib model, basic rest (#793)

* first lib model

* add missing files

* happy test

* add vanilla rest for extend

* fix new url pattern

* address comments

* add v to tag

* bump ver

* add missing file when ren

* support multi pkg

* fix gh action

* fix env var

* ren title

* use gh action to set ver

* remove unused

* remove unused

src/KubernetesClient.Basic/Autorest/HttpExtensions.cs

@@ -0,0 +1,34 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+using System.Net.Http;
+using System.Net.Http.Headers;
+
+namespace k8s.Autorest
+{
+    /// <summary>
+    /// Extensions for manipulating HTTP request and response objects.
+    /// </summary>
+    internal static class HttpExtensions
+    {
+        /// <summary>
+        /// Get the content headers of an HttpRequestMessage.
+        /// </summary>
+        /// <param name="request">The request message.</param>
+        /// <returns>The content headers.</returns>
+        public static HttpHeaders GetContentHeaders(this HttpRequestMessage request)
+        {
+            return request?.Content?.Headers;
+        }
+
+        /// <summary>
+        /// Get the content headers of an HttpResponseMessage.
+        /// </summary>
+        /// <param name="response">The response message.</param>
+        /// <returns>The content headers.</returns>
+        public static HttpHeaders GetContentHeaders(this HttpResponseMessage response)
+        {
+            return response?.Content?.Headers;
+        }
+    }
+}