export declare class ProxyRequestHostError extends TypeError {
    constructor();
}
/**
 * Validate and canonicalize an HTTP Host authority. The result contains no
 * port and is safe to use as a routing or token-cache identity.
 */
export declare function normalizeProxyRequestHost(authority: string): string;
/** Validate and canonicalize an HTTP Host authority while preserving its port. */
export declare function normalizeProxyRequestAuthority(authority: string): string;
export declare function resolveProxyRequestHost(req: Request, url: URL): string;
export declare function resolveProxyRequestAuthority(req: Request, url: URL): string;
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