Can we initialise oauth_client when initialise JupyterLab, to support the case that Jupyter Api called when server not yet spawned

[linlol]

Hi team, I use JupyterHub in k8s with our internal OAuth

In my case, I developed an GET API (denoted as /base_url/sample) protected via @tornado.web.authenticate which is supposed to be called directly from browser

Behaviour would be tricky if jupyterLab pod isn't yet spawned, the behaviour would be like this.

1. Hub noticed that server/pod is not yet spawned, thus redirect user to hub's home page /${prefix}/hub/home
2. User select correct profile to spawn server
3. After spawn, user would be redirected to /base_url/sample with 403 error, the reason is that user is redirect but /oauth_callback is not yet requested, thus, user's oauth_client_id is not yet set in cookie

Is there any workarounds to avoid this behaviour with proper protection?

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