A PyPI cache using nginx.

This serves as a caching mirror for PyPI. It's a simple stateless service and does not support uploading packages / private indices. For this use case, I've found it to be significantly faster and significantly more reliable than devpi.

To run it locally:

docker run -p 80:80 --rm $(docker build -q .)

To tell pip to connect to this instead of pypi.org, use:

pip install --index-url=http:https://localhost/simple mypy

or

export PIP_INDEX_URL=http:https://localhost/simple
pip install mypy

It turns out it's surprisingly easy to mess something up and not actually end up proxying requests. tests/mitmtest.sh should help confirm that we're hitting the cache when we expect to, instead of hitting upstream PyPI.

The log messages are also pretty useful (check nginx.conf to see exactly what these correspond to):

172.17.0.1 - localhost [13/Jan/2023:02:36:00 +0000] request_time=0.000 upstream_time=- cache_status=HIT 	200 "GET /simple/mypy/ HTTP/1.1" 78368