code: func (oauth *Oauth) GetWebAppRedirectURL(redirectURI, scope, state string) (string, error) {
  	urlStr := url.QueryEscape(redirectURI)
  	return fmt.Sprintf(webAppRedirectOauthURL, oauth.AppID, urlStr, scope, state), nil
  }
docs: //GetWebAppRedirectURL 获取网页应用跳转的url地址