Function shouldAttemptFallback

src/client/auth.ts:821–823

* Determines if fallback to root discovery should be attempted

(response: Response | undefined, pathname: string)

 * Determines if fallback to root discovery should be attempted
 */
function shouldAttemptFallback(response: Response | undefined, pathname: string): boolean {
    return !response || (response.status >= 400 && response.status < 500 && pathname !== '/');
}

/**
 * Generic function for discovering OAuth metadata with fallback support