def on_frame(self, frame_in):
        """On RPC Frame.

        :param specification.Frame frame_in: Amqp frame.
        :return:
        """
        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
On RPC Frame.

        :param specification.Frame frame_in: Amqp frame.
        :return: