code: def reply(self, connection, reply, orig_req):
          
          if isinstance(connection, ClientRequestConnection):
              self._logger.warn(
                  'Deprecation warning: do not use self.reply() '
                  'within a reply handler context -- use req.reply(*msg_args)\n'
                  'or req.reply_with_message(msg) Traceback:\n %s',
                  "".join(traceback.format_stack()))
              # Get the underlying ClientConnection instance
              connection = connection.client_connection
          connection.reply(reply, orig_req)
docs: Send an asynchronous reply to an earlier request.
  
          Parameters
          ----------
          connection : ClientConnection object
              The client to send the reply to.
          reply : Message object
              The reply message to send.
          orig_req : Message object
              The request message being replied to. The reply message's
              id is overridden with the id from orig_req before the
              reply is sent.