diff --git a/websocket-sharp/Net/HttpUtility.cs b/websocket-sharp/Net/HttpUtility.cs
index 03223ade..1b15d388 100644
--- a/websocket-sharp/Net/HttpUtility.cs
+++ b/websocket-sharp/Net/HttpUtility.cs
@@ -764,7 +764,7 @@ namespace WebSocketSharp.Net
         return false;
       }
 
-      return true;
+      return result != null;
     }
 
     #endregion