Index URLs aren't deduplicated when fetching

[charliermarsh]

If you run uv pip install flask --index https://pypi.org/simple --index-strategy unsafe-first-match, we fetch from PyPI twice: once for the default index, and again for --index https://pypi.org/simple .

[christeefy]

Hi @charliermarsh, I'm interested in working on this, and I've verified that this bug still exists on main today:

...
DEBUG Found stale response for: https://pypi.org/simple/flask/
DEBUG Sending revalidation request for: https://pypi.org/simple/flask/
DEBUG starting new connection: https://pypi.org/
DEBUG Found stale response for: https://pypi.org/simple/flask/
DEBUG Sending revalidation request for: https://pypi.org/simple/flask/
DEBUG starting new connection: https://pypi.org/
...

I like to confirm — is this still relevant and that there's no duplicate ongoing work before I start on this?

Thanks in advance!