Shared links with access tokens still result in 403s

JupyterHub Zero to JupyterHub on Kubernetes
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Just ran across this thread which seems related.

Although @minrk does not provide a specific issue link for the bug they’ve discovered, I set the relevant environment variable:

c.Spawner.environment = {
    "JUPYTERHUB_SINGLEUSER_EXTENSION": "0",
}

and it DOES seem to have fixed the websocket 403 issue. I don’t understand why or what changed, but this is a workable solution for the time being.