Interface RequestHeaders

interface RequestHeaders {
    accept?: string;
    "accept-encoding"?: string;
    "accept-language"?: string;
    authorization?: string;
    "cache-control"?: string;
    "content-type"?: string;
    "content-length"?: string;
    cookie?: string;
    host?: string;
    origin?: string;
    referer?: string;
    "user-agent"?: string;
    "x-forwarded-for"?: string;
    "x-forwarded-host"?: string;
    "x-forwarded-proto"?: string;
    "x-requested-with"?: string;
    [key: string]: string | string[] | undefined;
}