internal WebSocketResponse(int connId, bool asClient, ISendIO conn)
 {
     _connId   = connId;
     _sendIO   = conn;
     _asClient = asClient;
     if (asClient)
     {
         _rdForMask = new Random();
     }
 }
 internal HttpResponse(ISendIO sendIO)
 {
     _sendIO = sendIO;
     _bodyMs = new MemoryStream();
 }