code: func (c *DeliverConnection) Send(seekInfo *ab.SeekInfo) error {
  	if c.Closed() {
  		return errors.New("connection is closed")
  	}
  
  	logger.Debugf("Sending %#v", seekInfo)
  
  	env, err := c.createSignedEnvelope(seekInfo)
  	if err != nil {
  		return err
  	}
  
  	return c.deliverStream().Send(env)
  }
docs: // Send sends a seek request to the deliver server