code: func (p *WebPage) Open(url string) error {
  	req := map[string]interface{}{
  		"ref": p.ref.id,
  		"url": url,
  	}
  	var resp struct {
  		Status string `json:"status"`
  	}
  	if err := p.ref.process.doJSON("POST", "/webpage/Open", req, &resp); err != nil {
  		return err
  	}
  
  	if resp.Status != "success" {
  		return errors.New("failed")
  	}
  	return nil
  }
docs: // Open opens a URL.