Merge pull request #1442 from Unity-Technologies/fix-1338465

Adding a missed ConfigureAwait(false) within MyGetResponseAsync (case 1338465)

Author: UnityAlex

mcs/class/System/System.Net/HttpWebRequest.cs

@@ -1010,7 +1010,7 @@ async Task<HttpWebResponse> MyGetResponseAsync (CancellationToken cancellationTo
 
 					WebConnection.Debug ($"HWR GET RESPONSE LOOP: Req={ID} Op={operation?.ID} {auth_state.NtlmAuthState}");
 
-					writeStream = await operation.GetRequestStreamInternal ();
+					writeStream = await operation.GetRequestStreamInternal ().ConfigureAwait (false);
 					await writeStream.WriteRequestAsync (cancellationToken).ConfigureAwait (false);
 
 					stream = await operation.GetResponseStream ();