code: function () {
        if (this.auth_url) {
          return this.auth_url;
        }
        var self = this,
          destination = {
            protocol: 'https',
            host: 'www.box.com',
            pathname: '/api/oauth2/authorize',
            search: querystring.stringify({
              response_type: 'code',
              client_id: self.client_id,
              state: self.csrf,
              redirect_uri: 'http://' + self.host + ':' + self.port + '/authorize?id=' + self.email
            })
          };
  
        self.auth_url = url.format(destination);
        return self.auth_url;
      }
docs: The returned URL should be provided to the end user when running in standalone mode.
  @summary Get the authentication URL to manually navigate to.
  @returns {string} The authentication URL.