code: def on_frame(self, frame_in):
          
          if frame_in.name not in self._request:
              return False
  
          uuid = self._request[frame_in.name]
          if self._response[uuid]:
              self._response[uuid].append(frame_in)
          else:
              self._response[uuid] = [frame_in]
          return True
docs: On RPC Frame.
  
          :param specification.Frame frame_in: Amqp frame.
          :return: