Merge pull request #13 from StackExchange/memory-stream-allocs

Try to avoid an extra array alloc/copy in SendProtobuf

Author: mgravell

global.json

@@ -1,5 +1,7 @@
 {
   "sdk": {
-    "version": "2.2.100"
+    "version": "2.2.100",
+    "rollForward": "latestMajor",
+    "allowPrerelease": false
   }
 }

src/StackExchange.Utils.Http/Extensions.Send.cs

@@ -88,7 +88,9 @@ public static IRequestBuilder SendProtobuf(this IRequestBuilder builder, object
             {
                 Serializer.Serialize(gzs, obj);
                 gzs.Close();
-                var protoContent = new ByteArrayContent(output.ToArray());
+                var protoContent = output.TryGetBuffer(out var segment)
+                    ? new ByteArrayContent(segment.Array, segment.Offset, segment.Count)
+                    : new ByteArrayContent(output.ToArray());
                 protoContent.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                 protoContent.Headers.Add("Content-Encoding", "gzip");
                 return SendContent(builder, protoContent);