Hi

On windows, reqwest reads the registry and sets proxy from there.
Implemented in #547 .

First, I want to say it is great !

However, I have an issue that I can't mitigate from this change.
At work, we have 2 proxies : one auth, one basic.
By default from GPO, settings point to the auth proxy, which is not supported by reqwest.
If I set the basic proxy in the environment, it is ignored. Which is what is expected from the code.

I need environment to take precedence over registry, if it is set. And I think this is expected behaviour.

Do you think it can be changed ?

NB: My issue arised when trying to update rust with rustup, which use reqwest.