[Bug]: FastAPI Swagger /docs does not working correctly

[sciafri]

Your current environment

The latest vLLM docker: vllm/vllm-openai:v0.4.0

Issue seems to exist as far back as 0.2.7.

🐛 Describe the bug

Visiting http://localhost:8080/docs when running the server offline shows a blank page however loads with the proper title for the page. I haven't yet attempted this with an online / non-firewalled running instance of vLLM.

Inspecting the page with developer tools shows some html, however there are errors in downloading .js files from a cdn so I suspect that is the problem.

Is there a way to enable support for the Swagger documentation offline?

Since I'm unable to test, http://localhost:8080/docs properly functioning with online instances?

[simon-mo]

downloading .js files from a cdn

This sounds like the default behavior of FastAPI which we use under the hood. Can you check this is the same issue with a simple FastAPI app?

[hmellor]

This doesn't seem to be a vLLM issue