Enable restarting the Panel server or reloading the apps

[MarcSkovMadsen]

The jupyter-panel-proxy is quite powerful. But the apps are loaded once when the panel server is started.

I.e. does not support use cases where users are updating their app code. I see use cases where

• The user is the developer and updates the code her self.
• The user is just updating the code via git pull.
• The user is just working on a shared drive where the code is being updated by another user or system team. This could be the case on a Jupyter Hub I am the product owner for at work.

Potential solutions could be

• Enable adding --auto flag when the server starts. The problem is that this is not quite robust, i.e. the server might get stuck.
• Enable adding the --reload flag when the server starts. The problem is that this is not quite robust. i.e. the server might get stuck.
• Enable the user to somehow manually force a restart of the server. The problem is that it needs to be restarted on the same port and base_url.

Maybe this does not have to be solved by jupyter-panel-proxy. Maybe this is as simple as restarting the jupyter (hub) server?? And telling users how to do this :-) But at least this is not a working solution for binder where every change is gone once you restart the jupyter binder server.

[MarcSkovMadsen]

I can see that the jupyter-server-proxy will restart the service if it exits with a non-zero exit code. So maybe that it just a possiblity to use.