code: func (c *Client) Notify(ctx context.Context, method string, args ...interface{}) error {
  	op := new(requestOp)
  	msg, err := c.newMessage(method, args...)
  	if err != nil {
  		return err
  	}
  	msg.ID = nil
  
  	if c.isHTTP {
  		return c.sendHTTP(ctx, op, msg)
  	} else {
  		return c.send(ctx, op, msg)
  	}
  }
docs: // Notify sends a notification, i.e. a method call that doesn't expect a response.