docs: def touch(self, message_id, reservation_id, timeout=None):
          """Touching a reserved message extends its timeout to the duration specified when the message was created.
  
          Arguments:
          message_id -- The ID of the message.
          reservation_id -- Reservation Id of the message.
          timeout -- Optional. The timeout in seconds after which new reservation will expire.
          """
          url = "queues/%s/messages/%s/touch" % (self.name, message_id)
          qitems = {'reservation_id': reservation_id}
          if timeout is not None:
              qitems['timeout'] = timeout
          body = json.dumps(qitems)
  
          response = self.client.post(url, body=body,
                                      headers={'Content-Type': 'application/json'})
  
          return response['body']