Patch to make the HTTPClient proxy-aware

[wltbenade]

Signed-off-by: Louwrens Benade tobias.benade@absa.africa

Provide a description of what has been changed

Checklist

• Commits are signed with Developer Certificate of Origin (DCO - learn more)
• A PR is opened to update the documentation on (repo) (if applicable)
• Changelog has been updated and is aligned with our changelog requirements

Fixes #2577

This patch addresses #2577

• Simple implementation to allow the HTTPClient to read proxy variables, if available, from the environment.
• No tests updated, as all scalers should behave as normal.

[wltbenade]

@JorTurFer, apologies. I screwed up on the previous patch. quite a few files got tagged when I reset the branch.

Resubmitted here. Will add PR for keda-docs shortly.

[JorTurFer]

LGTM
❤️ ❤️ ❤️

[wltbenade]

keda-docs PR submitted #730

[wltbenade]

@JorTurFer, regarding your Helm chart question:

I don't think it's necessary, as those who work with proxies will know by now how to add the environment variables to a chart's env section.

Thanks again for the guidance!

[zroubalik]

Looking good, the code just needs formatting :)

[zroubalik]

@wltbenade would you mind fixing the formatting, please?

[JorTurFer]

hi @wltbenade
There is a conflict on CHANGELOD.md, could you solve it?
There is also a problem with your latest commit because it's not signed, could you sign it please?
https://github.com/kedacore/keda/blob/main/CONTRIBUTING.md#i-didnt-sign-my-commit-now-what

[zroubalik]

Yeah, you should rebase, your branch is way too behind the main.

[wltbenade]

Yeah, you should rebase, your branch is way too behind the main.

Done :)

@wltbenade would you mind fixing the formatting, please?

Done :)

Also DCO is failing: https://github.com/kedacore/keda/blob/main/CONTRIBUTING.md#i-didnt-sign-my-commit-now-what

and done :)

[zroubalik]

LGTM, thanks for the contribution!