Bug report

In response to #104049, a fix and a new test were added in #104067 and related PRs. The test in test_httpserver.py uses an fstring with an escape sequence, but does not use r:

f'listing for {self.base_url}/\?x=123'

I think the code (in two places) should be include an r: fr'listing for ...

On PyPy this is causing the test___all__.py test to fail, since it emits a warning when compiling the *.py to *.pyc. I am not sure why CPython is not seeing a similar problem. Perhaps compileall is run first? Or the warning filter captures the compilation as well as the import?

Your environment

• CPython versions tested on: PyPy3.9 HEAD using stdlib 3.9.17
• Operating system and architecture: any