diff --git a/source/NetCoreServer/WebSocket.cs b/source/NetCoreServer/WebSocket.cs
index ab375f0..c19327b 100644
--- a/source/NetCoreServer/WebSocket.cs
+++ b/source/NetCoreServer/WebSocket.cs
@@ -232,12 +232,13 @@ public bool PerformServerUpgrade(HttpRequest request, HttpResponse response)
             response.SetHeader("Connection", "Upgrade");
             response.SetHeader("Upgrade", "websocket");
             response.SetHeader("Sec-WebSocket-Accept", accept);
-            response.SetBody();
 
             // Validate WebSocket upgrade request and response
             if (!_wsHandler.OnWsConnecting(request, response))
                 return false;
-
+            
+            response.SetBody();
+            
             // Send WebSocket upgrade response
             _wsHandler.SendUpgrade(response);