module.exports = ["Content-ID", "Content-MD5", "DNT", "ETag", "P3P", "TE", "WWW-Authenticate", "X-ATT-DeviceId", "X-UA-Compatible", "X-WebKit-CSP", "X-XSS-Protection"].reduce(function (map, headerName) {
      map[headerName.toLowerCase()] = headerName;
      return map;
    }, {});