/**
 * Headers containing more information about the resource to be fetched or about the client itself.
 * @see https://developer.mozilla.org/en-US/docs/Glossary/Request_header
 * @public
 */
export declare const RequestHeader: {
    /**
     * Used when issuing a preflight request to let the server know which HTTP headers will be used
     * when the actual request is made.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Request-Headers)
     */
    AccessControlRequestHeaders: "access-control-request-headers";
    /**
     * Used when issuing a preflight request to let the server know which HTTP method will be used
     * when the actual request is made.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Request-Method)
     */
    AccessControlRequestMethod: "access-control-request-method";
    /**
     * Indicates where a fetch originates from.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Origin)
     */
    Origin: "origin";
    /**
     * Contains the credentials to authenticate a user agent with a server.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Authorization)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.8)
     */
    Authorization: "authorization";
    /**
     * Contains the credentials to authenticate a user agent with a proxy server.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Proxy-Authorization)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.34)
     */
    ProxyAuthorization: "proxy-authorization";
    /**
     * Informs the server about the types of data that can be sent back. It is MIME-type.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1)
     */
    Accept: "accept";
    /**
     * Informs the server about which character set the client is able to understand.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Charset)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.2)
     */
    AcceptCharset: "accept-charset";
    /**
     * Informs the server about the encoding algorithm, usually a compression algorithm,
     * that can be used on the resource sent back.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3)
     */
    AcceptEncoding: "accept-encoding";
    /**
     * Informs the server about the language the server is expected to send back.
     * This is a hint and is not necessarily under the full control of the user:
     * the server should always pay attention not to override an explicit user choice
     * (like selecting a language in a drop down list).
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4)
     */
    AcceptLanguage: "accept-language";
    /**
     * Specifies directives for caching mechanisms in both requests and responses.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9)
     */
    CacheControl: "cache-control";
    /**
     * Implementation-specific header that may have various effects anywhere along the request-response chain.
     * Used for backwards compatibility with HTTP/1.0 caches where the `Cache-Control` header is not yet present.
     * @deprecated
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Pragma)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.32)
     */
    Pragma: "pragma";
    /**
     * Specifies the transfer encodings the user agent is willing to accept.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/TE)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.39)
     */
    TE: "te";
    /**
     * Contains an Internet email address for a human user who controls the requesting user agent.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/From)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.22)
     */
    From: "from";
    /**
     * Specifies the domain name of the server (for virtual hosting), and (optionally) the TCP port number on which the server is listening.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Host)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.23)
     */
    Host: "host";
    /**
     * The address of the previous web page from which a link to the currently requested page was followed.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referer)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.36)
     */
    Referer: "referer";
    /**
     * Contains a characteristic string that allows the network protocol peers to identify
     * the application type, operating system, software vendor or software version
     * of the requesting software user agent.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.43)
     */
    UserAgent: "user-agent";
    /**
     * Indicates expectations that need to be fulfilled by the server in order to properly handle the request.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.20)
     */
    Expect: "expect";
    /**
     * Provides a mechanism with the `TRACE` and `OPTIONS` methods to limit the number
     * of proxies or gateways that can forward the request to the next inbound server.
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.31)
     */
    MaxForwards: "max-forwards";
    /**
     * Contains information from the client-facing side of proxy servers
     * that is altered or lost when a proxy is involved in the path of the request.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Forwarded)
     */
    Forwarded: "forwarded";
    /**
     * Identifies the originating IP addresses of a client connecting to a web server
     * through an HTTP proxy or a load balancer.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For)
     */
    XForwardedFor: "x-forwarded-for";
    /**
     * Identifies the original host requested that a client used to connect to your proxy or load balancer.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host)
     */
    XForwardedHost: "x-forwarded-host";
    /**
     * Identifies the protocol (HTTP or HTTPS) that a client used to connect to your proxy or load balancer.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto)
     */
    XForwardedProto: "x-forwarded-proto";
    /**
     * Added by proxies, both forward and reverse proxies, and can appear in the request headers and the response headers.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Via)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.45)
     */
    Via: "via";
    /**
     * Makes the request conditional and applies the method only if the stored resource matches one of the given ETags.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Match)
     */
    IfMatch: "if-match";
    /**
     * Makes the request conditional and applies the method only if the stored resource doesn't match any of the given ETags.
     *
     * This is used to update caches (for safe requests), or to prevent to upload a new resource when one is already existing.
     *
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-None-Match)
     */
    IfNoneMatch: "if-none-match";
    /**
     * Makes the request conditional and expects the entity to be transmitted only if it has been modified after the given date.
     *
     * This is used to transmit data only when the cache is out of date.
     *
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Modified-Since)
     */
    IfModifiedSince: "if-modified-since";
    /**
     * Makes the request conditional and expects the entity to be transmitted only if it has not been modified after the given date.
     *
     * This is used to ensure the coherence of a new fragment of a specific range with previous ones,
     * or to implement an optimistic concurrency control system when modifying existing documents.
     *
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Unmodified-Since)
     */
    IfUnmodifiedSince: "if-unmodified-since";
    /**
     * Indicates the part of a document that the server should return.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Range)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35)
     */
    Range: "range";
    /**
     * Creates a conditional range request that is only fulfilled if the given etag or date matches the remote resource.
     * Used to prevent downloading two ranges from incompatible version of the resource.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Range)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.27)
     */
    IfRange: "if-range";
    /**
     * Contains stored HTTP cookies previously sent by the server with the `Set-Cookie` header.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cookie)
     */
    Cookie: "cookie";
    /**
     * Used for expressing the user's tracking preference.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/DNT)
     */
    DNT: "dnt";
    /**
     * Controls whether the network connection stays open after the current transaction finishes.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.10)
     */
    Connection: "connection";
    /**
     *
     * Controls how long a persistent connection should stay open.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Keep-Alive)
     *
     */
    KeepAlive: "keep-alive";
    /**
     * Is a response header if the resource transmitted should be displayed `inline`
     * (default behavior when the header is not present),
     * or it should be handled like a download or `attachment` and the browser should present a 'Save As' window.
     *
     * Is a general header when used on the subpart of a multipart body to give information about the field it applies to.
     *
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition)
     */
    ContentDisposition: "content-disposition";
    /**
     * Sends a signal to the server expressing the client’s preference for an encrypted and authenticated response,
     * and that it can successfully handle the `upgrade-insecure-requests` directive.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Upgrade-Insecure-Requests)
     */
    UpgradeInsecureRequests: "upgrade-insecure-requests";
    /**
     * Mainly used to identify Ajax requests. Most JavaScript frameworks send this field with value of XMLHttpRequest.
     */
    XRequestedWith: "x-requested-with";
    /**
     * Used to prevent cross-site request forgery.
     *
     * https://en.wikipedia.org/wiki/Cross-site_request_forgery#Cookie-to-header_token
     */
    XCSRFToken: "x-csrf-token";
    /**
     * Indicates the user agent's preference for reduced data usage.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Save-Data)
     */
    SaveData: "save-data";
    /**
     * A general warning field containing information about possible problems.
     * @deprecated
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Warning)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.46)
     */
    Warning: "warning";
    /**
     * Contains the date and time at which the message was originated.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Date)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.18)
     */
    Date: "date";
    /**
     * The standard establishes rules for upgrading or changing to a different protocol on the current client, server, transport protocol connection.
     *
     * For example, this header standard allows a client to change from HTTP 1.1 to HTTP 2.0,
     * assuming the server decides to acknowledge and implement the Upgrade header field.
     * Neither party is required to accept the terms specified in the Upgrade header field.
     *
     * It can be used in both client and server headers. If the Upgrade header field is specified,
     * then the sender MUST also send the Connection header field with the upgrade option specified.
     *
     *
     * https://tools.ietf.org/html/rfc7230#section-6.7
     */
    Upgrade: "upgrade";
    /**
     * Requests a web application to override the method specified in the request (typically `POST`)
     * with the method given in the header field (typically `PUT` or `DELETE`).
     *
     * This can be used when a user agent or firewall prevents `PUT` or `DELETE` methods from being sent directly
     * (note that this is either a bug in the software component, which ought to be fixed,
     * or an intentional configuration, in which case bypassing it may be the wrong thing to do).
     *
     *
     * https://opensocial.github.io/spec/2.5.1/Core-API-Server.xml#rfc.section.2.1.1.1
     */
    XHttpMethodOverride: "x-http-method-override";
    /**
     * Connection-specific header field that includes parameters that govern the HTTP/2 connection,
     * provided in anticipation of the server accepting the request to upgrade from HTTP/1.1 to HTTP/2.
     *
     * https://httpwg.org/specs/rfc7540.html#Http2SettingsHeader
     */
    Http2Settings: "http2-settings";
    /**
     * Indicates the size of the entity-body, in decimal number of octets, sent to the recipient.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Length)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.13)
     */
    ContentLength: "content-length";
    /**
     * Indicates the media type of the resource.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17)
     */
    ContentType: "content-type";
    /**
     * MD5 digest of the entity-body for the purpose of providing
     * an end-to-end message integrity check (MIC) of the entity-body.
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.15)
     */
    ContentMd5: "content-md5";
};
export type RequestHeader = typeof RequestHeader[keyof typeof RequestHeader] | RefletHttp.RequestHeader[keyof RefletHttp.RequestHeader];
export declare namespace RequestHeader {
    /**
     * @public
     */
    type Record = Partial<globalThis.Record<RequestHeader, string>>;
}
/**
 * Headers with additional information about the response, like its location or about the server itself (name and version, etc).
 * @see https://developer.mozilla.org/en-US/docs/Glossary/Response_header
 * @public
 */
export declare const ResponseHeader: {
    /**
     * Indicates whether the response can be shared.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin)
     */
    AccessControlAllowOrigin: "access-control-allow-origin";
    /**
     * Indicates whether the response to the request can be exposed when the credentials flag is true.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials)
     */
    AccessControlAllowCredentials: "access-control-allow-credentials";
    /**
     * Used in response to a preflight request to indicate which HTTP headers can be used when making the actual request.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Headers)
     */
    AccessControlAllowHeaders: "access-control-allow-headers";
    /**
     * Specifies the method or methods allowed when accessing the resource in response to a preflight request.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Methods)
     */
    AccessControlAllowMethods: "access-control-allow-methods";
    /**
     * Indicates which headers can be exposed as part of the response by listing their names.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Expose-Headers)
     */
    AccessControlExposeHeaders: "access-control-expose-headers";
    /**
     * Indicates how long the results of a preflight request can be cached.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Max-Age)
     */
    AccessControlMaxAge: "access-control-max-age";
    /**
     * Used to remove the path restriction by including this header in the response of the serviceworker script.
     *
     * https://w3c.github.io/ServiceWorker/#path-restriction
     *
     * https://w3c.github.io/ServiceWorker/#service-worker-allowed
     */
    ServiceWorkerAllowed: "service-worker-allowed";
    /**
     * Specifies origins that are allowed to see values of attributes retrieved via features of the Resource Timing API,
     * which would otherwise be reported as zero due to cross-origin restrictions.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Timing-Allow-Origin)
     */
    TimingAllowOrigin: "timing-allow-origin";
    /**
     * Specifies if a cross-domain policy file (crossdomain.xml) is allowed. The file may define a policy to grant web clients,
     * such as Adobe's Flash Player, Adobe Acrobat (PDF Reader), Microsoft Silverlight and Apache Flex,
     * permission to handle data across domains that would otherwise be restricted due to the Same-Origin Policy.
     *
     * https://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html
     *
     * https://helmetjs.github.io/docs/crossdomain/
     */
    XPermittedCrossDomainPolicies: "x-permitted-cross-domain-policies";
    /**
     * Defines the authentication method that should be used to gain access to a resource.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/WWW-Authenticate)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.47)
     */
    WwwAuthenticate: "www-authenticate";
    /**
     * Defines the authentication method that should be used to gain access to a resource behind a Proxy server.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Proxy-Authenticate)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.33)
     */
    ProxyAuthenticate: "proxy-authenticate";
    /**
     * Specifies directives for caching mechanisms in both requests and responses.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9)
     */
    CacheControl: "cache-control";
    /**
     * Implementation-specific header that may have various effects anywhere along the request-response chain.
     * Used for backwards compatibility with HTTP/1.0 caches where the `Cache-Control` header is not yet present.
     * @deprecated
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Pragma)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.32)
     */
    Pragma: "pragma";
    /**
     * The time in seconds the object has been in a proxy cache.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Age)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17)
     */
    Age: "age";
    /**
     * Clears browsing data (e.g. cookies, storage, cache) associated with the requesting website.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Clear-Site-Data)
     */
    ClearSiteData: "clear-site-data";
    /**
     * The date/time after which the response is considered stale.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expires)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.21)
     */
    Expires: "expires";
    /**
     * Governs which referrer information sent in the `Referer` header should be included with requests made.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy)
     *
     * https://helmetjs.github.io/docs/referrer-policy/
     */
    ReferrerPolicy: "referrer-policy";
    /**
     * Contains information about the software used by the origin server to handle the request.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Server)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.38)
     */
    Server: "server";
    /**
     * Is a response header if the resource transmitted should be displayed `inline`
     * (default behavior when the header is not present),
     * or it should be handled like a download or `attachment` and the browser should present a 'Save As' window.
     *
     * Is a general header when used on the subpart of a multipart body to give information about the field it applies to.
     *
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition)
     */
    ContentDisposition: "content-disposition";
    /**
     * Indicates the URL to redirect a page to.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Location)
     */
    Location: "location";
    /**
     * Added by proxies, both forward and reverse proxies, and can appear in the request headers and the response headers.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Via)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.45)
     */
    Via: "via";
    /**
     * It is a validator, the last modification date of the resource, used to compare several versions of the same resource.
     *
     * It is less accurate than `ETag`, but easier to calculate in some environments.
     * Conditional requests using `If-Modified-Since` and `If-Unmodified-Since` use this value
     * to change the behavior of the request.
     *
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Last-Modified)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.29)
     */
    LastModified: "last-modified";
    /**
     * It is a validator, a unique string identifying the version of the resource.
     * Conditional requests using `If-Match` and `If-None-Match` use this value to change the behavior of the request.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19)
     */
    ETag: "etag";
    /**
     * Determines how to match future request headers to decide whether a cached response can be used
     * rather than requesting a fresh one from the origin server.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Vary)
     */
    Vary: "vary";
    /**
     * Indicates if the server supports range requests, and if so in which unit the range can be expressed.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Ranges)
     */
    AcceptRanges: "accept-ranges";
    /**
     * Specifies the form of encoding used to safely transfer the entity to the user.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Transfer-Encoding)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.41)
     */
    TransferEncoding: "transfer-encoding";
    /**
     * Allows the sender to include additional fields at the end of chunked message.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Trailer)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.40)
     */
    Trailer: "trailer";
    /**
     * Send cookies from the server to the user agent.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie)
     */
    SetCookie: "set-cookie";
    /**
     * Indicates the tracking status that applied to the corresponding request.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Tk)
     */
    Tk: "tk";
    /**
     * Controls whether the network connection stays open after the current transaction finishes.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.10)
     */
    Connection: "connection";
    /**
     *
     * Controls how long a persistent connection should stay open.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Keep-Alive)
     *
     */
    KeepAlive: "keep-alive";
    /**
     * Prevents other domains from opening/controlling a window.
     * (COOP)
     *
     * https://www.chromestatus.com/feature/5432089535053824
     */
    CrossOriginOpenerPolicy: "cross-origin-opener-policy";
    /**
     * Prevents other domains from reading the response of the resources to which this header is applied.
     * (CORP)
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Resource-Policy)
     */
    CrossOriginResourcePolicy: "cross-origin-resource-policy";
    /**
     * Controls resources the user agent is allowed to load for a given page.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy)
     *
     * https://helmetjs.github.io/docs/csp/
     */
    ContentSecurityPolicy: "content-security-policy";
    /**
     * Allows web developers to experiment with policies by monitoring, but not enforcing, their effects.
     * These violation reports consist of JSON documents sent via an HTTP POST request to the specified URI.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only)
     */
    ContentSecurityPolicyReportOnly: "content-security-policy-report-only";
    /**
     * Allows sites to opt in to reporting and/or enforcement of Certificate Transparency requirements,
     * which prevents the use of misissued certificates for that site from going unnoticed.
     * When a site enables the `Expect-CT` header, they are requesting that Chrome check
     * that any certificate for that site appears in public CT logs.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect-CT)
     *
     * https://helmetjs.github.io/docs/expect-ct/
     */
    ExpectCT: "expect-ct";
    /**
     * Provides a mechanism to allow and deny the use of browser features in its own frame,
     * and in iframes that it embeds.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy)
     *
     * https://helmetjs.github.io/docs/feature-policy/
     */
    FeaturePolicy: "feature-policy";
    /**
     * Associates a specific cryptographic public key with a certain web server to decrease
     * the risk of {@link https://developer.mozilla.org/en-US/docs/Glossary/MITM | MITM} attacks with forged certificates.
     * (HPKP)
     * @deprecated
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Public-Key-Pins)
     */
    PublicKeyPins: "public-key-pins";
    /**
     * Sends reports to the report-uri specified in the header and does still allow clients
     * to connect to the server even if the pinning is violated.
     * @deprecated
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Public-Key-Pins-Report-Only)
     */
    PublicKeyPinsReportOnly: "public-key-pins-report-only";
    /**
     * Force communication using HTTPS instead of HTTP.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security)
     *
     * https://helmetjs.github.io/docs/hsts/
     */
    StrictTransportSecurity: "strict-transport-security";
    /**
     * Disables MIME sniffing and forces browser to use the type given in `Content-Type`.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options)
     *
     * https://helmetjs.github.io/docs/dont-sniff-mimetype/
     */
    XContentTypeOptions: "x-content-type-options";
    /**
     * Indicates that the browser (Internet Explorer) should not display the option
     * to "Open" a file that has been downloaded from an application, to prevent phishing attacks
     * as the file otherwise would gain access to execute in the context of the application.
     * @deprecated
     *
     * https://helmetjs.github.io/docs/ienoopen/
     */
    XDownloadOptions: "x-download-options";
    /**
     * Indicates whether a browser should be allowed to render a page in a `<frame>,` `<iframe>`, `<embed>` or `<object>`.
     * (XFO)
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options)
     *
     * https://helmetjs.github.io/docs/frameguard/
     */
    XFrameOptions: "x-frame-options";
    /**
     * May be set by hosting environments or other frameworks and contains information
     * about them while not providing any usefulness to the application or its visitors.
     * Unset this header to avoid exposing potential vulnerabilities.
     *
     * https://helmetjs.github.io/docs/hide-powered-by/
     */
    XPoweredBy: "x-powered-by";
    /**
     * Enables cross-site scripting filtering.
     * @deprecated
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection)
     *
     * https://helmetjs.github.io/docs/xss-filter/
     */
    XXSSProtection: "x-xss-protection";
    /**
     * A general warning field containing information about possible problems.
     * @deprecated
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Warning)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.46)
     */
    Warning: "warning";
    /**
     * Contains the date and time at which the message was originated.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Date)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.18)
     */
    Date: "date";
    /**
     * The standard establishes rules for upgrading or changing to a different protocol on the current client, server, transport protocol connection.
     *
     * For example, this header standard allows a client to change from HTTP 1.1 to HTTP 2.0,
     * assuming the server decides to acknowledge and implement the Upgrade header field.
     * Neither party is required to accept the terms specified in the Upgrade header field.
     *
     * It can be used in both client and server headers. If the Upgrade header field is specified,
     * then the sender MUST also send the Connection header field with the upgrade option specified.
     *
     * https://tools.ietf.org/html/rfc7230#section-6.7
     */
    Upgrade: "upgrade";
    /**
     * Specifies the patch document formats accepted by the server.
     *
     * Its presence in response to any method is an implicit indication
     * that `PATCH` is allowed on the resource identified by the Request-URI.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Patch)
     */
    AcceptPatch: "accept-patch";
    /**
     * Used to list alternate ways to reach this service.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Alt-Svc)
     */
    AltSvc: "alt-svc";
    /**
     * Indicates how long the user agent should wait before making a follow-up request.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.37)
     */
    RetryAfter: "retry-after";
    /**
     * Controls DNS prefetching, a feature by which browsers proactively perform domain name resolution
     * on both links that the user may choose to follow as well as URLs for items referenced
     * by the document, including images, CSS, JavaScript, and so forth.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control)
     *
     * https://helmetjs.github.io/docs/dns-prefetch-control/
     */
    XDNSPrefetchControl: "x-dns-prefetch-control";
    /**
     * Links generated code to a source map.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/SourceMap)
     */
    SourceMap: "sourcemap";
    /**
     * Tells the browser that the page being loaded is going to want to perform a large allocation.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Large-Allocation)
     */
    LargeAllocation: "large-allocation";
    /**
     * Communicates one or more metrics and descriptions for the given request-response cycle.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Server-Timing)
     */
    ServerTiming: "server-timing";
    /**
     * Recommends the preferred rendering engine (often a backward-compatibility mode)
     * to use to display the content. Also used to activate Chrome Frame in Internet Explorer.
     *
     * https://docs.microsoft.com/en-us/openspecs/ie_standards/ms-iedoco/380e2488-f5eb-4457-a07a-0cb1b6e4b4b5
     */
    XUACompatible: "x-ua-compatible";
    /**
     * Used to indicate how a web page is to be indexed within public search engine results.
     * The header is effectively equivalent to `<meta name="robots" content="...">`.
     *
     * [MDN Reference](https://developers.google.com/search/reference/robots_meta_tag)
     */
    XRobotsTag: "x-robots-tag";
    /**
     * Indicates the size of the entity-body, in decimal number of octets, sent to the recipient.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Length)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.13)
     */
    ContentLength: "content-length";
    /**
     * Indicates the media type of the resource.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17)
     */
    ContentType: "content-type";
    /**
     * Used to specify the compression algorithm.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Encoding)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.11)
     */
    ContentEncoding: "content-encoding";
    /**
     * Describes the language(s) intended for the audience,
     * so that it allows a user to differentiate according to the users' own preferred language.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Language)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.12)
     */
    ContentLanguage: "content-language";
    /**
     * Indicates an alternate location for the returned data.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Location)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.14)
     */
    ContentLocation: "content-location";
    /**
     * Indicates where in a full body message a partial message belongs.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Range)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.16)
     */
    ContentRange: "content-range";
    /**
     * MD5 digest of the entity-body for the purpose of providing
     * an end-to-end message integrity check (MIC) of the entity-body.
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.15)
     */
    ContentMd5: "content-md5";
    /**
     * Lists the set of HTTP request methods support by a resource.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Allow)
     *
     * [W3C Reference](https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.7)
     */
    Allow: "allow";
    /**
     * Provides a means for serialising one or more links in HTTP headers.
     * It is semantically equivalent to the HTML `<link>` element.
     *
     * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Link)
     */
    Link: "link";
};
export type ResponseHeader = typeof ResponseHeader[keyof typeof ResponseHeader] | RefletHttp.ResponseHeader[keyof RefletHttp.ResponseHeader];
export declare namespace ResponseHeader {
    /**
     * @public
     */
    type Record = Partial<globalThis.Record<ResponseHeader, string>>;
}
declare global {
    namespace RefletHttp {
        /**
         * Augments union type of RequestHeader.
         */
        interface RequestHeader {
        }
        /**
         * Augments union type of ResponseHeader.
         */
        interface ResponseHeader {
        }
    }
}