This article delves into a critical yet often overlooked aspect of .NET authentication—the handling of authentication failures in distributed architectures. While the default cookie-based authentication configuration redirects unauthorized requests to `/Account/Login` with a 302 status code, this approach breaks when applications are decoupled into frontend and backend services. The hardcoded backend domain in the redirect location causes frontend clients to encounter invalid endpoints, creating a silent failure loop. The author identifies a fundamental limitation in the framework's design: the inability to customize the redirect domain through `options.LoginPath`, which forces developers to rethink traditional authentication workflows. A practical solution emerges by swapping the 302 redirect for a 401 Unauthorized response, enabling frontend applications to intercept the status code and implement custom login logic. This approach leverages API interceptors (demonstrated with Axios) t...--Qwen3