code: function synthesizeUrl(serviceConfig, req, res) {
    const parameters = _.map(serviceConfig.getParameters(req, res), (value, key) => {
      return `${key}=${value}`;
    }).join('&');
  
    if (parameters) {
      return encodeURI(`${serviceConfig.getUrl(req)}?${parameters}`);
    } else {
      return serviceConfig.getUrl(req);
    }
  
  }
docs: superagent doesn't exposed the assembled GET request, so synthesize it