/**
 * Redirects the request to a proxy server with a given URL. But not for:
 *
 * - Relative URLs
 * - URLs that seem to point to a local IP (except the proxy is on the same domain)
 * - URLs that don't look like a domain
 **/
export declare function redirectToProxy(proxyUrl?: string, url?: string): string;
/**
 * Returns false for requests to localhost, relative URLs, if no proxy is defined …
 **/
export declare function shouldUseProxy(proxyUrl?: string, url?: string): url is string;
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