import type { HttpDestination } from './destination';
import type { Protocol } from './protocol';
/**
 * Extracts the http protocol from the destination URL. The default value is http if no protocol is given.
 * @param destination - URL of this destination is parsed
 * @throws Error in case a unsupported protocol is given in the destination URL like rfc://example.com.
 * @returns The protocol, either https or http.
 * @internal
 */
export declare function getProtocolOrDefault(destination: HttpDestination): Protocol;