HTTP proxy support

[Razz4780]

Would you like to work on this feature?

yes

What problem are you trying to solve?

kube-client crate currently supports only SOCKS5 proxies in the kubeconfig (config.proxy_url, HTTP[S]_PROXY/http[s]_proxy env variables). Relevant code starts here. However, proxy can also use the regular HTTP protocol.

Describe the solution you'd like

Inspect scheme of the proxy URI and optionally wrap the base connector with hyper_proxy. Hide it behind a new feature http_proxy (name suggestions welcome).

Found some past discussions on this:
#1010
#837

Describe alternatives you've considered

None so far

Documentation, Adoption, Migration Strategy

No response

Target crate for feature

kube-client

[clux]

I like the proposal of this in theory because I would also like to support it, but it has one problem practically; the proposed crate has not had a release in over 2 years.

If we were to do this, I would personally prefer to do it after the hyper 1.0 upgrade in #1351 (since we are already having to deal with infrequently updated connector libraries there and this feature would compound that). Waiting for 1.0 would mean getting a 1.0 upgrade pushed up into hyper-proxy first though.

[aviramha]

We have implemented it in our fork, and now that the hyper 1.0 upgrade is done we shall send a PR :)