Reverse proxy caches login page after maintenance mode

Scenario

Users continue seeing maintenance or login loops because the reverse proxy cached the wrong response during a deployment.

Recommended Resolution Path

1. Purge the specific proxy cache and verify response headers on dynamic routes.
2. Check whether maintenance mode pages were cached upstream or by a CDN.
3. Test from a fresh browser and direct backend path if available.
4. Document cache bypass rules for future deployments.

Technician Notes

Document what changed, what confirmed the fix, and whether the issue points to a broader standards gap worth addressing for the client.