Function tryMetadataDiscovery

src/client/auth.ts:811–816

* Tries to discover OAuth metadata at a specific URL

(url: URL, protocolVersion: string, fetchFn: FetchLike = fetch)

 * Tries to discover OAuth metadata at a specific URL
 */
async function tryMetadataDiscovery(url: URL, protocolVersion: string, fetchFn: FetchLike = fetch): Promise<Response | undefined> {
    const headers = {
        'MCP-Protocol-Version': protocolVersion
    };
    return await fetchWithCorsRetry(url, headers, fetchFn);
}

/**
 * Determines if fallback to root discovery should be attempted