code: func (c *Conn) SendRequest(method string, params interface{}, resHandler func(res *ResCtx) error) (reqID string, err error) {
  	id, err := shortid.UUID()
  	if err != nil {
  		return "", err
  	}
  
  	req := request{ID: id, Method: method, Params: params}
  	if err = c.send(req); err != nil {
  		return "", err
  	}
  
  	c.resRoutes.Set(req.ID, resHandler)
  	return id, nil
  }
docs: // SendRequest sends a JSON-RPC request through the connection with an auto generated request ID.
  // resHandler is called when a response is returned.