Use jupyter-server-proxy with hub in kubernetes

A few additional details about the context (maybe I’ve not been very clear):
I want to give jupyter notebook’s users the ability to start a web server by themselves. I don’t want jupyter-server-proxy to start the web server itself, that’s why I didn’t provide any jupyter_notebook_config.py file as detailed in the documentation.

Anyway, I’m totally blind to understand what’s going on once I installed jupyter-server-proxy in the environment. Are there some logs files that could give me some clues ?