[Modify] Put it back

sta · sta · commit eedd814429e6 · 2018-07-04T20:11:47.000+09:00
diff --git a/websocket-sharp/Server/WebSocketBehavior.cs b/websocket-sharp/Server/WebSocketBehavior.cs
@@ -319,7 +319,9 @@ public Func<string, bool> OriginValidator {
     /// </exception>
     public string Protocol {
       get {
-        return _protocol ?? String.Empty;
+        return _websocket != null
+               ? _websocket.Protocol
+               : (_protocol ?? String.Empty);
       }
 
       set {
