/**
 * Fetch wrapper that re-attaches the Authorization header after cross-origin
 * redirects (browsers strip it per spec) and retries on transient 401s.
 *
 * 503 handling is intentionally omitted here — it belongs in
 * {@link StreamManager.fetchOneTimeTicket} where it can invalidate the relay
 * host cache and retry with the template URL.
 *
 * @param input - The URL to fetch.
 * @param init - Standard fetch RequestInit options.
 * @param retries - Maximum number of retries (default 10).
 * @param signal - Optional AbortSignal to cancel the fetch and retries.
 */
export declare function fetchWithRedirectAuthorization(input: string, init: RequestInit, retries?: number, signal?: AbortSignal): Promise<Response>;
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