I need to instantiate a local proxy in Go (accessible via http://localhost:8080) which itself passes through another proxy (accessible via http://vvv:[email protected]:zzz).

I can do this just fine in JS via:

const ProxyChain = require('proxy-chain');

const server = new ProxyChain.Server({
    port: 8080,
    verbose: true,
    prepareRequestFunction: ({ request, username, password, hostname, port, isHttp, connectionId }) => {
        return {
            upstreamProxyUrl: `http://vvv:[email protected]:zzz`,
        };
    },
});

server.listen(() => {
    console.log(`Proxy server is listening`);
});

But for performance reasons (I need to instantiate hundreds of local proxies) I’m looking for an equivalent in Go, in particular to chain with another proxy.

Any ideas ?

I’ve already tried several Go libraries (goproxy, …) but what gets in the way every time is the chain with the remote proxy, which is either ignored, or it’s the user/password that doesn’t seem to be transmitted.