--proxy does not override global config

[p-fruck]

Description

I tried install some project requirements on windows on a machine that I require using a proxy. Using pip install --proxy myproxy I am able to install prcompiled wheels, but the installation of redfish failed during the Installing build dependencies step.

I have a config file in %APPDATA%/pip/pip.ini with the following content:

[global]
proxy = otherproxy

Expected behavior

The --proxy flag should override the global configuration.

pip version

23.2.1

Python version

3.11

OS

Windows 10 Enterprise

How to Reproduce

1. Configure %APPDATA%/pip/pip.ini with otherproxy
2. run pip install --proxy myproxy redfish
3. Notice otherproxy being used for installing build dependencies

Output

No response

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[jzchiang]

To add to this, when a --proxy argument is provided to pip install, but a proxy is not specified in the global settings, no proxy is used for installing build dependencies.

[notatallshaw]

Thanks for reporting, this is actually a duplicate of #6018 which is waiting on someone to raise a PR for this.

As mentioned in there, the general workaround is to use the PIP_PROXY environmental variable, or standard HTTP proxy environmental variables (#6018).