/**
 * URL utility functions for provider management
 */
/**
 * Normalize a provider URL to ensure it has a valid protocol
 * Supports both http:// and https:// protocols
 *
 * @param url - URL to normalize (can be with or without protocol)
 * @param preferHttps - If true, prefer HTTPS when protocol is missing (default: false)
 * @returns Normalized URL with protocol, or null if invalid
 */
export declare function normalizeProviderUrl(url: string | null | undefined, preferHttps?: boolean): string | null;
/**
 * Get both HTTP and HTTPS variants of a URL
 * Useful for trying both protocols when one fails
 *
 * @param url - Base URL (with or without protocol)
 * @returns Object with httpUrl and httpsUrl, or null if URL is invalid
 */
export declare function getProtocolVariants(url: string | null | undefined): {
    httpUrl: string;
    httpsUrl: string;
} | null;
/**
 * Try to determine the working protocol for a URL
 * Attempts both HTTP and HTTPS and returns the one that works
 *
 * @param baseUrl - Base URL without protocol or with one protocol
 * @param testPath - Optional path to test (default: '/')
 * @param timeout - Timeout in milliseconds (default: 5000)
 * @returns The working protocol ('http' or 'https') or null if neither works
 */
export declare function detectWorkingProtocol(baseUrl: string, testPath?: string, timeout?: number): Promise<'http' | 'https' | null>;
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