code: function clientRes(res) {
      if (!res || !res.statusCode) {
          return (res);
      }
  
      return ({
          statusCode: res.statusCode,
          headers: res.headers
      });
  }
docs: a response serializer. returns a stripped down object for logging.
  @private
  @function clientRes
  @param    {Object} res the response object
  @returns  {Object}