Add ability to hijack requests

[yotamN]

I want to be able to hijack the proxy traffic, mostly for reading but ideally also for writing.
I was thinking of implementing a way to return from prepareRequestFunction a method to handle a request/CONNECT stream instead of the default handling.
Something like this:

const server = new ProxyChain.Server({
	port: 8080,
	prepareRequestFunction({ hostname }) {
		return {
			connectTunnelHandler(sourceSocket) {
                            // proxy-chain won't open a target socket
                        }
		};
	},
});

Before working on it, I would like to get feedback to know if it's something welcomed.
I know that the CONNECT traffic is encrypted but in cases where breaking the encryption is okay (like my own use case) it can be useful.

[jancurn]

You can already do this, either return a static response with customResponseFunction or use a local web server as the upstream, and there you can do whatever you want.