--- title: "SuperHeaders" source: "https://github.com/remix-run/remix/blob/8905f3943706e1f53696ab83e70a84873cabfc90/packages/headers/src/lib/super-headers.ts#L357" --- # SuperHeaders ## Summary An enhanced JavaScript `Headers` interface with lazy, type-safe property accessors. ## Signature ```ts class SuperHeaders { constructor(init: SuperHeadersInit): SuperHeaders // Accessors get accept(): Accept get acceptCharset(): string | null get acceptEncoding(): AcceptEncoding get acceptLanguage(): AcceptLanguage get acceptPatch(): string | null get acceptPost(): string | null get acceptRanges(): string | null get accessControlAllowCredentials(): string | null get accessControlAllowHeaders(): string | null get accessControlAllowMethods(): string | null get accessControlAllowOrigin(): string | null get accessControlExposeHeaders(): string | null get accessControlMaxAge(): number | null get accessControlRequestHeaders(): string | null get accessControlRequestMethod(): string | null get age(): number | null get allow(): string | null get authorization(): string | null get cacheControl(): CacheControl get connection(): string | null get contentDisposition(): ContentDisposition get contentEncoding(): string | null get contentLanguage(): string | null get contentLength(): number | null get contentLocation(): string | null get contentRange(): ContentRange get contentSecurityPolicy(): string | null get contentSecurityPolicyReportOnly(): string | null get contentType(): ContentType get cookie(): Cookie get crossOriginEmbedderPolicy(): string | null get crossOriginEmbedderPolicyReportOnly(): string | null get crossOriginOpenerPolicy(): string | null get crossOriginOpenerPolicyReportOnly(): string | null get crossOriginResourcePolicy(): string | null get date(): Date | null get etag(): string | null get expect(): string | null get expires(): Date | null get forwarded(): string | null get from(): string | null get host(): string | null get idempotencyKey(): string | null get ifMatch(): IfMatch get ifModifiedSince(): Date | null get ifNoneMatch(): IfNoneMatch get ifRange(): IfRange get ifUnmodifiedSince(): Date | null get keepAlive(): string | null get lastModified(): Date | null get link(): string | null get location(): string | null get maxForwards(): number | null get origin(): string | null get permissionsPolicy(): string | null get pragma(): string | null get prefer(): string | null get preferenceApplied(): string | null get range(): Range get referer(): string | null get referrerPolicy(): string | null get refresh(): string | null get retryAfter(): string | null get server(): string | null get setCookie(): SetCookieList get strictTransportSecurity(): string | null get traceparent(): string | null get tracestate(): string | null get upgradeInsecureRequests(): number | null get userAgent(): string | null get vary(): Vary get via(): string | null get wwwAuthenticate(): string | null get xContentTypeOptions(): string | null get xForwardedFor(): string | null get xForwardedHost(): string | null get xForwardedProto(): string | null get xFrameOptions(): string | null get xPoweredBy(): string | null get xRobotsTag(): string | null // Methods [iterator](): HeadersIterator<[string, string]> append(name: string, value: string): void apply(init: SuperHeadersInit): this delete(name: string): void entries(): HeadersIterator<[string, string]> forEach(callbackfn: (value: string, key: string, parent: Headers) => void, thisArg: any): void get(name: string): string | null getSetCookie(): string[] has(name: string): boolean keys(): HeadersIterator set(name: string, value: string): void values(): HeadersIterator } ``` ## Accessors ### `accept` ### `acceptCharset` ### `acceptEncoding` ### `acceptLanguage` ### `acceptPatch` ### `acceptPost` ### `acceptRanges` ### `accessControlAllowCredentials` ### `accessControlAllowHeaders` ### `accessControlAllowMethods` ### `accessControlAllowOrigin` ### `accessControlExposeHeaders` ### `accessControlMaxAge` ### `accessControlRequestHeaders` ### `accessControlRequestMethod` ### `age` ### `allow` ### `authorization` ### `cacheControl` ### `connection` ### `contentDisposition` ### `contentEncoding` ### `contentLanguage` ### `contentLength` ### `contentLocation` ### `contentRange` ### `contentSecurityPolicy` ### `contentSecurityPolicyReportOnly` ### `contentType` ### `cookie` ### `crossOriginEmbedderPolicy` ### `crossOriginEmbedderPolicyReportOnly` ### `crossOriginOpenerPolicy` ### `crossOriginOpenerPolicyReportOnly` ### `crossOriginResourcePolicy` ### `date` ### `etag` ### `expect` ### `expires` ### `forwarded` ### `from` ### `host` ### `idempotencyKey` ### `ifMatch` ### `ifModifiedSince` ### `ifNoneMatch` ### `ifRange` ### `ifUnmodifiedSince` ### `keepAlive` ### `lastModified` ### `link` ### `location` ### `maxForwards` ### `origin` ### `permissionsPolicy` ### `pragma` ### `prefer` ### `preferenceApplied` ### `range` ### `referer` ### `referrerPolicy` ### `refresh` ### `retryAfter` ### `server` ### `setCookie` ### `strictTransportSecurity` ### `traceparent` ### `tracestate` ### `upgradeInsecureRequests` ### `userAgent` ### `vary` ### `via` ### `wwwAuthenticate` ### `xContentTypeOptions` ### `xForwardedFor` ### `xForwardedHost` ### `xForwardedProto` ### `xFrameOptions` ### `xPoweredBy` ### `xRobotsTag` ## Methods ### `[iterator](): HeadersIterator<[string, string]>` ### `append(name: string, value: string): void` The **`append()`** method of the Headers interface appends a new value onto an existing header inside a Headers object, or adds the header if it does not already exist. [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers/append) ### `apply(init: SuperHeadersInit): this` Applies header values to this instance using header-aware merge semantics. #### Parameters ##### `init` Header values to apply. ### `delete(name: string): void` The **`delete()`** method of the Headers interface deletes a header from the current Headers object. [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers/delete) ### `entries(): HeadersIterator<[string, string]>` Returns an iterator allowing to go through all key/value pairs contained in this object. ### `forEach(callbackfn: (value: string, key: string, parent: Headers) => void, thisArg: any): void` ### `get(name: string): string | null` The **`get()`** method of the Headers interface returns a byte string of all the values of a header within a Headers object with a given name. If the requested header doesn't exist in the Headers object, it returns null. [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers/get) ### `getSetCookie(): string[]` The **`getSetCookie()`** method of the Headers interface returns an array containing the values of all Set-Cookie headers associated with a response. This allows Headers objects to handle having multiple Set-Cookie headers, which wasn't possible prior to its implementation. [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers/getSetCookie) ### `has(name: string): boolean` The **`has()`** method of the Headers interface returns a boolean stating whether a Headers object contains a certain header. [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers/has) ### `keys(): HeadersIterator` Returns an iterator allowing to go through all keys of the key/value pairs contained in this object. ### `set(name: string, value: string): void` The **`set()`** method of the Headers interface sets a new value for an existing header inside a Headers object, or adds the header if it does not already exist. [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers/set) ### `values(): HeadersIterator` Returns an iterator allowing to go through all values of the key/value pairs contained in this object.