/**
 * Headers utility functions
 */
import type { HeadersHandler } from "../types";
export interface ForwardedHeaders {
    host: string | null;
    origin: string | null;
    referer: string | null;
    userAgent: string | null;
    xForwardedHost: string | null;
    xForwardedProto: string | null;
    xForwardedFor: string | null;
}
export declare function extractForwardedHeaders(headersList: HeadersHandler): ForwardedHeaders;
export declare function applyForwardedHeaders(headers: Headers, forwarded: ForwardedHeaders): void;