def sendResponse(self, message, UUID, routing_key):
        """
        Send `message` to ``self.output_exchange`` with routing key
        ``self.output_key``, ``self.content_type`` in ``delivery_mode=2``.

        Args:
            message (str): message which will be sent
            UUID: unique identification of message
            routing_key (str): which routing key to use to send message back
        """
        self.sendMessage(
            exchange=self.output_exchange,
            routing_key=routing_key,
            message=message,
            UUID=UUID
        )