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'use strict'
/**
* @see https://developer.mozilla.org/docs/Web/HTTP/Headers
*/
const wellknownHeaderNames = /** @type {const} */ ([
'Accept',
'Accept-Encoding',
'Accept-Language',
'Accept-Ranges',
'Access-Control-Allow-Credentials',
'Access-Control-Allow-Headers',
'Access-Control-Allow-Methods',
'Access-Control-Allow-Origin',
'Access-Control-Expose-Headers',
'Access-Control-Max-Age',
'Access-Control-Request-Headers',
'Access-Control-Request-Method',
'Age',
'Allow',
'Alt-Svc',
'Alt-Used',
'Authorization',
'Cache-Control',
'Clear-Site-Data',
'Connection',
'Content-Disposition',
'Content-Encoding',
'Content-Language',
'Content-Length',
'Content-Location',
'Content-Range',
'Content-Security-Policy',
'Content-Security-Policy-Report-Only',
'Content-Type',
'Cookie',
'Cross-Origin-Embedder-Policy',
'Cross-Origin-Opener-Policy',
'Cross-Origin-Resource-Policy',
'Date',
'Device-Memory',
'Downlink',
'ECT',
'ETag',
'Expect',
'Expect-CT',
'Expires',
'Forwarded',
'From',
'Host',
'If-Match',
'If-Modified-Since',
'If-None-Match',
'If-Range',
'If-Unmodified-Since',
'Keep-Alive',
'Last-Modified',
'Link',
'Location',
'Max-Forwards',
'Origin',
'Permissions-Policy',
'Pragma',
'Proxy-Authenticate',
'Proxy-Authorization',
'RTT',
'Range',
'Referer',
'Referrer-Policy',
'Refresh',
'Retry-After',
'Sec-WebSocket-Accept',
'Sec-WebSocket-Extensions',
'Sec-WebSocket-Key',
'Sec-WebSocket-Protocol',
'Sec-WebSocket-Version',
'Server',
'Server-Timing',
'Service-Worker-Allowed',
'Service-Worker-Navigation-Preload',
'Set-Cookie',
'SourceMap',
'Strict-Transport-Security',
'Supports-Loading-Mode',
'TE',
'Timing-Allow-Origin',
'Trailer',
'Transfer-Encoding',
'Upgrade',
'Upgrade-Insecure-Requests',
'User-Agent',
'Vary',
'Via',
'WWW-Authenticate',
'X-Content-Type-Options',
'X-DNS-Prefetch-Control',
'X-Frame-Options',
'X-Permitted-Cross-Domain-Policies',
'X-Powered-By',
'X-Requested-With',
'X-XSS-Protection'
])
/** @type {Record<typeof wellknownHeaderNames[number]|Lowercase<typeof wellknownHeaderNames[number]>, string>} */
const headerNameLowerCasedRecord = {}
// Note: object prototypes should not be able to be referenced. e.g. `Object#hasOwnProperty`.
Object.setPrototypeOf(headerNameLowerCasedRecord, null)
/**
* @type {Record<Lowercase<typeof wellknownHeaderNames[number]>, Buffer>}
*/
const wellknownHeaderNameBuffers = {}
// Note: object prototypes should not be able to be referenced. e.g. `Object#hasOwnProperty`.
Object.setPrototypeOf(wellknownHeaderNameBuffers, null)
/**
* @param {string} header Lowercased header
* @returns {Buffer}
*/
function getHeaderNameAsBuffer (header) {
let buffer = wellknownHeaderNameBuffers[header]
if (buffer === undefined) {
buffer = Buffer.from(header)
}
return buffer
}
for (let i = 0; i < wellknownHeaderNames.length; ++i) {
const key = wellknownHeaderNames[i]
const lowerCasedKey = key.toLowerCase()
headerNameLowerCasedRecord[key] = headerNameLowerCasedRecord[lowerCasedKey] =
lowerCasedKey
}
module.exports = {
wellknownHeaderNames,
headerNameLowerCasedRecord,
getHeaderNameAsBuffer
}
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