Interface OutgoingHttpHeaders

interface OutgoingHttpHeaders {
    accept?: string | string[];
    "accept-charset"?: string | string[];
    "accept-encoding"?: string | string[];
    "accept-language"?: string | string[];
    "accept-ranges"?: string;
    "access-control-allow-credentials"?: string;
    "access-control-allow-headers"?: string;
    "access-control-allow-methods"?: string;
    "access-control-allow-origin"?: string;
    "access-control-expose-headers"?: string;
    "access-control-max-age"?: string;
    "access-control-request-headers"?: string;
    "access-control-request-method"?: string;
    age?: string;
    allow?: string;
    authorization?: string;
    "cache-control"?: string;
    "cdn-cache-control"?: string;
    connection?: string | string[];
    "content-disposition"?: string;
    "content-encoding"?: string;
    "content-language"?: string;
    "content-length"?: string | number;
    "content-location"?: string;
    "content-range"?: string;
    "content-security-policy"?: string;
    "content-security-policy-report-only"?: string;
    cookie?: string | string[];
    date?: string;
    dav?: string | string[];
    dnt?: string;
    etag?: string;
    expect?: string;
    expires?: string;
    forwarded?: string;
    from?: string;
    host?: string;
    "if-match"?: string;
    "if-modified-since"?: string;
    "if-none-match"?: string;
    "if-range"?: string;
    "if-unmodified-since"?: string;
    "last-modified"?: string;
    link?: string | string[];
    location?: string;
    "max-forwards"?: string;
    origin?: string;
    prgama?: string | string[];
    "proxy-authenticate"?: string | string[];
    "proxy-authorization"?: string;
    "public-key-pins"?: string;
    "public-key-pins-report-only"?: string;
    range?: string;
    referer?: string;
    "referrer-policy"?: string;
    refresh?: string;
    "retry-after"?: string;
    "sec-websocket-accept"?: string;
    "sec-websocket-extensions"?: string | string[];
    "sec-websocket-key"?: string;
    "sec-websocket-protocol"?: string | string[];
    "sec-websocket-version"?: string;
    server?: string;
    "set-cookie"?: string | string[];
    "strict-transport-security"?: string;
    te?: string;
    trailer?: string;
    "transfer-encoding"?: string;
    upgrade?: string;
    "upgrade-insecure-requests"?: string;
    "user-agent"?: string;
    vary?: string;
    via?: string | string[];
    warning?: string;
    "www-authenticate"?: string | string[];
    "x-content-type-options"?: string;
    "x-dns-prefetch-control"?: string;
    "x-frame-options"?: string;
    "x-xss-protection"?: string;
    [key: string]: undefined | OutgoingHttpHeader;
}