Test if /valid is a blocking request
https://github.com/huggingface/datasets-server/issues/250#issuecomment-1142013300

> > the requests to /valid are very long: do they block the incoming requests?)
> Depends on if your long running query is blocking the GIL or not. If you have async calls, it should be able to switch and take care of other requests, if it's computing something then yeah, probably blocking everything else.

- [ ] find if the long requests like /valid are blocking the concurrent requests
- [ ] if so: fix it
Test if /valid is a blocking request: https://github.com/huggingface/datasets-server/issues/250#issuecomment-1142013300

> > the requests to /valid are very long: do they block the incoming requests?)
> Depends on if your long running query is blocking the GIL or not. If you have async calls, it should be able to switch and take care of other requests, if it's computing something then yeah, probably blocking everything else.

- [ ] find if the long requests like /valid are blocking the concurrent requests
- [ ] if so: fix it