docs: function (url, qsName, qsValue) {
  
      let urlObj = Url.parse(url);
      if (qsName && qsValue) {
          urlObj.query = Querystring.parse(qsName + '=' + qsValue);
          urlObj.search = '?' + encodeURIComponent(qsName) + '=' + encodeURIComponent(qsValue);
      } else {
          urlObj.search = '';
      }
      return urlObj.format(urlObj);
  }