pip can't automatically handle system proxy setting correctly

[hashuser]

Description

Because for some reason I have to use proxy in order to accelerate package download, but from pip20.3 it can't automatically handle system proxy setting correctly and makes me fell crazy. Every time, when I want to download something I have to switch my proxy off and then everything works well except the slow downloading speed. You known It feel sucks, when using pip makes installing 3rd party packages more difficult. This problem has been reported for a long time, I though this would be solved very soon, but I'm totally wrong. There wasn't any progress in the last 6 months! You ignored the voice from users! Now I feel very disappointed to this community!

Expected behavior

No doubt you know the expected behaviour.

pip version

20.3+

Python version

3.6 3.7 3.8 3.9 3.10

OS

Windows

How to Reproduce

1. Get random package
2. An error occurs.

Output

No response

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[uranusjr]

Please see #9216 (comment)