docs: function notAcceptable(options) {
    const acceptableTypes = options.accept;
  
    return function (req, res, next) {
      let message, code,
        matchedType = req.accepts(acceptableTypes);
  
      if (matchedType) {
        next();
      } else {
        code = 406;
        message = req.get('Accept') + ' not acceptable';
        res.set('Accept', acceptableTypes.join(', ').toLowerCase());
        sendDefaultResponseForCode(code, message, res, options);
      }
    };
  }