docs: def to_response(self, sign, code=200, data=None):
          """
          transform message to response message
          Notice: this method will return a deepcopy
          """
          msg = copy.deepcopy(self)
          msg.data = data
  
          setattr(msg, 'code', code)
          for _ in ["query", "param", "tunnel"]:
              if not hasattr(msg, _):
                  continue
              delattr(msg, _)
  
          if hasattr(msg, 'sign') and isinstance(msg.sign, list):
              msg.sign.append(sign)
          else:
              msg.sign = [sign]
  
          msg._type = Message.get_message_type(msg.__dict__)
  
          return msg