code: function sendHTMLErrorCode(code, message, res) {
    return function () {
      res.type('html');
      res.send(code + ' ' + message);
    };
  }
docs: Send some html (should probably be some default, or a render of a 500 page)
  @param {number} code
  @param {string} message
  @param {object} res
  @returns {function}