[Modify] Replace it

websocket-sharp/Net/HttpListenerRequest.cs

@@ -608,7 +608,7 @@ namespace WebSocketSharp.Net
           return;
         }
 
-        var output = _context.Connection.GetResponseStream ();
+        var output = _connection.GetResponseStream ();
         output.InternalWrite (_100continue, 0, _100continue.Length);
       }
     }