FastAPI WebSocket returns HTTP 404 on Spaces

[John6666]

I wonder if this bug (?) is also occurring in FastAPI…

Persistent 404 on Docker Space - app_port routing seems to be ignored (User: josejar)

Hello Hugging Face community and team, I am writing to report a persistent and blocking issue with every Docker-based Space I create. I have tried all troubleshooting steps and I’m hoping someone can help. I am posting this without links due to the new user filter. The Problem: My Docker Spaces consistently return a 404 error on their public URL. The application logs confirm a successful startup on the correct internal port, so the core issue seems to be that the app_port directive in my READ…