code: function getStatus (res) {
  		let status;
  		const statusCode = res.statusCode;
  		if (statusCode) {
  			status = Math.floor(statusCode / 100) * 100;
  		}
  		switch (status) {
  			case 100:
  			case 200:
  			case 300:
  				return 'success';
  			default:
  				return 'failure';
  		}
  	}
docs: derive the status string from the status code
  @param  {Object} res express res object
  @return {string}     success or error string