Running `python3 -m pydoc ensurepip` gives me: https://docs.python.org/3.9/library/ensurepip but it should be: https://docs.python.org/3.9/library/ensurepip.html Issue is in getdocloc function on the line: docloc = "%s/%s" % (docloc.rstrip("/"), object.__name__.lower()) But it previously worked as the nginx config for the doc server contains: # Emulate Apache's content-negotiation. Was a temporary measure, # but now people are using it like a feature. location ~ ^/((2|3)(\.[0-8])?|dev)/\w+/[\d\w\.]+(?!\.html)$ { if (-f "${request_filename}.html") { return 301 https://$host:$request_uri.html; } } (So yes "people are using it like a feature" contains pydoc :)) Notice the [0-8], which does not match for my /3.9/. I propose to fix the issue on both sides: - On psf-salt to allow 3.9 to get the "temporary" measure. - pydoc side to simplify the code

This is now fixed on the docs server thanks to [1], so it should work for already release Python 3.9 :) [1]: https://github.com/python/psf-salt/pull/198 I still did a PR on cpython to avoid a redirection, and get cpython itself out of the "people use this temporary fix as a feature now".

 New changeset eb9983c59b0683270328b5c40a115bb028209511 by Julien Palard in branch 'master': bpo-42869: Avoid an HTTP redirection. (GH-24174) https://github.com/python/cpython/commit/eb9983c59b0683270328b5c40a115bb028209511