redis documentation incomplete - REDIS_URL variable is missing

[mglaubitz]

I tried to set up openwebui with UVICORN_WORKERS > 1 and failed since I had forgotten so set the REDIS_URL environment variable.

I had followed the instructions on

https://docs.openwebui.com/tutorials/integrations/redis/

which do not mention the REDIS_URL variable. It might be a good idea to add this piece of information there.

[Classic298]

RE: open-webui/open-webui#18366

Thanks will tackle this soon.