content: /// Type safe representation of HTTP headers.
  enum HttpHeaderName {
    accept('accept'),
    acceptCharset('accept-charset'),
    acceptEncoding('accept-encoding'),
    acceptLanguage('accept-language'),
    acceptRanges('accept-ranges'),
    accessControlAllowCredentials('access-control-allow-credentials'),
    accessControlAllowHeaders('access-control-allow-headers'),
    accessControlAllowMethods('access-control-allow-methods'),
    accessControlAllowOrigin('access-control-allow-origin'),
    accessControlExposeHeaders('access-control-expose-headers'),
    accessControlMaxAge('access-control-max-age'),
    accessControlRequestHeaders('access-control-request-headers'),
    accessControlRequestMethod('access-control-request-method'),
    age('age'),
    allow('allow'),
    altSvc('alt-svc'),
    authorization('authorization'),
    cacheControl('cache-control'),
    cacheStatus('cache-status'),
    cdnCacheControl('cdn-cache-control'),
    connection('connection'),
    contentDisposition('content-disposition'),
    contentEncoding('content-encoding'),
    contentLanguage('content-language'),
    contentLength('content-length'),
    contentLocation('content-location'),
    contentRange('content-range'),
    contentSecurityPolicy('content-security-policy'),
    contentSecurityPolicyReportOnly('content-security-policy-report-only'),
    contentType('content-type'),
    cookie('cookie'),
    dnt('dnt'),
    date('date'),
    etag('etag'),
    expect('expect'),
    expires('expires'),
    forwarded('forwarded'),
    from('from'),
    host('host'),
    ifMatch('if-match'),
    ifModifiedSince('if-modified-since'),
    ifNoneMatch('if-none-match'),
    ifRange('if-range'),
    ifUnmodifiedSince('if-unmodified-since'),
    lastModified('last-modified'),
    link('link'),
    location('location'),
    maxForwards('max-forwards'),
    origin('origin'),
    pragma('pragma'),
    proxyAuthenticate('proxy-authenticate'),
    proxyAuthorization('proxy-authorization'),
    publicKeyPins('public-key-pins'),
    publicKeyPinsReportOnly('public-key-pins-report-only'),
    range('range'),
    referer('referer'),
    referrerPolicy('referrer-policy'),
    refresh('refresh'),
    retryAfter('retry-after'),
    secWebSocketAccept('sec-websocket-accept'),
    secWebSocketExtensions('sec-websocket-extensions'),
    secWebSocketKey('sec-websocket-key'),
    secWebSocketProtocol('sec-websocket-protocol'),
    secWebSocketVersion('sec-websocket-version'),
    server('server'),
    setCookie('set-cookie'),
    strictTransportSecurity('strict-transport-security'),
    te('te'),
    trailer('trailer'),
    transferEncoding('transfer-encoding'),
    userAgent('user-agent'),
    upgrade('upgrade'),
    upgradeInsecureRequests('upgrade-insecure-requests'),
    vary('vary'),
    via('via'),
    warning('warning'),
    wwwAuthenticate('www-authenticate'),
    xContentTypeOptions('x-content-type-options'),
    xDnsPrefetchControl('x-dns-prefetch-control'),
    xFrameOptions('x-frame-options'),
    xXssProtection('x-xss-protection');
  
    final String httpName;
  
    const HttpHeaderName(this.httpName);
  }
  