Proxy missing on server >= 2.0

[akhmerov]

Bug description

I seem to be unable to be unable to access the proxy on jupyter-server 2.2.1;
Launching python -m http.server and then navigating to /user-redirect/proxy/8000 leads to a 404.

Your personal set up

> jupyter --version
Selected Jupyter core packages...
IPython          : 8.9.0
ipykernel        : 6.20.2
ipywidgets       : 8.0.4
jupyter_client   : 7.4.9
jupyter_core     : 5.1.5
jupyter_server   : 2.2.1
jupyterlab       : 3.6.1
nbclient         : 0.7.2
nbconvert        : 7.2.9
nbformat         : 5.7.3
notebook         : 6.5.2
qtconsole        : not installed
traitlets        : 5.8.1
> mamba list|grep proxy
configurable-http-proxy   4.5.4                h3b247e2_2    conda-forge
jupyter-server-proxy      3.2.2              pyhd8ed1ab_0    conda-forge
> mamba list|grep jupyterhub
jupyterhub                3.1.1              pyh2a2186d_0    conda-forge
jupyterhub-base           3.1.1              pyh2a2186d_0    conda-forge

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[takluyver]

I tried to reproduce this, but I ran into jupyter-server/jupyter_server#1038 - I just keep getting bounced to the login page when accessing Jupyter in any way.

[akhmerov]

Everything seems to work now, so this much have been resolved.