Running server.py in Docker container always seems to refuse HTTP access (403 Forbidden), so can't run test suite

[cjlee112]

I am running a Docker container (python:3.13.1-alpine) to provide the exact CPython version required for working with the corresponding Brython tagged version (3.13.1). I tried to follow the instructions in CONTRIBUTING.md for running the test suite. The server.py runs fine (no error messages), but all attempts to connect to it just get HTTP status 403 Forbidden.

The commands for reproducing this, assuming you are in the Brython source directory, having already run make_dist.py and ready to run the test suite::

docker run -it --rm -p 8000:8000 -v "$PWD":/user/src/brython -w /usr/src/brython python:3.13.1-alpine sh
pip install aiohttp
python server.py

Now back in your host shell::

firefox http://localhost:8000/tests

Note same 403 error happens if you connect directly to the docker container IP address::

firefox http://172.17.0.2:8000/tests

[cjlee112]

Hmm, exact same 403 error happens when I run server.py in a regular shell (i.e. without using Docker). So apparently the problem is not associated with using Docker. Perhaps some additional python packages (not just aiohttp) need to be installed for server.py to work properly? May be related to #2557 since I am unable to find a requirements.txt list of what packages need to be installed.