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tech debug

Mobile Chrome Redirects Back to Login After Sign-In: Debugging an HTTP-to-HTTPS Entry Point Issue

When mobile Chrome keeps redirecting back to the login page after sign-in, the culprit isn't always OAuth or broken frontend state. In this case, the root cause was that the HTTP entry point for app-dev.daodao.so wasn't issuing a 301 redirect to HTTPS, so /auth/me requests sent with an http origin didn't include the auth_token cookie.

#cloudflare#debugging#cookie#chrome#nextjs#auth
tech debug

Local AI Backend API Always Returns Empty Data: Cookie Domain Isolation

The main backend runs on a remote HTTPS server, so the auth_token cookie is scoped to that domain. The browser never sends it to the local AI backend, causing the API to treat every request as unauthenticated.

#cookie#cors#fastapi#nextjs#auth#local-dev#debug