https.Agent support for proxy server

[robertpatrick]

What is the problem this feature will solve?

I am trying to write a Nuxt3 application where the nitro server routes need to make Rest calls to a Kubernetes API Server in an environment where my company's network requires the use of an HTTP proxy server to reach the Kubernetes cluster.

When not on the corporate network, I am able to use code that looks like this:

import { Agent } from 'https';
...
const httpsAgent = new Agent({ ca: caCert });
const res = await axios.get(`${ adminClusterBaseUrl }/version`, {
    httpsAgent,
    headers: {
        Authorization: `Bearer ${ token }`,
        Cookie:        getHeader(event, 'cookie'),
    },
});
return res.data;

However, when on the corporate network, I need to switch to using the https-proxy-agent to get proxy server support but unfortunately, it does not appear to support passing the CA certificate data through so the request is failing on a TLS handshake error. I would like to be able to use the built-in https.Agent both with and without an HTTP proxy server.

What is the feature you are proposing to solve the problem?

The need to use a third-party package like https-proxy-agent to get support for a proxy server.

What alternatives have you considered?

I tried passing the CA certificate option to the HttpsProxyServer constructor but it does not seem to be honoring it. See TooTallNate/proxy-agents#234.

[bnoordhuis]

This is a duplicate of an earlier feature request that I can't find anymore because searching for "http proxy" turns up way too many results...

...but at any rate, last time around there was a) no consensus that proxy support isn't a giant slippery slope, and b) no one was stepping up to do the work.

I'm personally mildly in favor but I'm also cognizant of the slippery slope angle. If you want to open a pull request, go ahead, but keep in mind it might be massively more complicated than you initially expect - even more so for http/2.