Very good, glad we could resolve it. I'll close the issue, hopefully we'll have a new PyPi release soon.

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What version of NativeAuthenticator are you using? Current master or PyPi?

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Wow, that was a quick reaction.
It is mentioned in the Dockerfile above, which version/distribution the docker image uses: I don't know.
It is the "official" jupyterhub/jupyterhub image.

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Ah, from your setup, it looks like you're using PyPi version. We've recently fixed a bug that presents like this (see #114 and #115), but there hasn't been a new PyPi release since then.

For a temporary workaround, you could try to install the current master branch instead of the package version.

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You mean like so: pip install git+https://github.com/jupyterhub/nativeauthenticator?

Problem solved!

Using master does the trick.
Additionally, the benchmark ab -c100 -n936 http://0.0.0.0:8000/hub/login does not take ~30 seconds, but 1 second.

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That should do, or otherwise like in the Quickstart Docs (this is how I do it), so like this:

git clone https://github.com/jupyterhub/nativeauthenticator.git
cd nativeauthenticator
pip install -e .

Could you test if either of those resolve your problem?

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For other users, here my Dockerfile:

ARG JUPYTERHUB_VERSION=latest
FROM jupyterhub/jupyterhub:${JUPYTERHUB_VERSION}
RUN apt-get update && apt-get install -yq --no-install-recommends git
RUN pip install --no-cache dockerspawner
RUN pip install git+https://github.com/jupyterhub/nativeauthenticator

Thanks @lambdaTotoro for the immediate reply!

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