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My web app loads fine (verified: python -c 'import app' and a full in-process login both work in ~0.4s), but the load balancer returns 502-backend for browser requests. Please check my backend/load-balancer health."

There are many things that can cause 502 errors. We have a help page https://help.pythonanywhere.com/pages/502BadGateway/ on how to diagnose them