Adding a client certificate with a proxied request in nodejs

My task is to forward incoming requests to a https URL while adding some headers and adding a client certificate

I'm trying to solve this in nodejs and am running into some issues.

This is the code I am currently playing around with:

http.createServer(onRequest).listen(cnf.port);

function onRequest(client_req, client_res) {
    console.log('serve: ' + client_req.url);

    let options = {
        hostname: 'some.host.name',
        port: 443,
        path: 'some/path',
        method: 'POST',
        cert: fs.readFileSync('./resources/cert.pem'),
        key: fs.readFileSync('./resources/key.pem'),
        timeout: 30000,
        headers: {
            'Accept': 'text/xml',
            'Content-Type': 'application/soap+xml',
            'charset': 'UTF-8',
            'KD_NR': 'XXXXX',
            'Z-Version': '1.8',
            // .. lots of other headers .. //
        }
    };

    let proxy = http.request(options, (res) => {
        console.log('Forwarding request request');
        res.pipe(client_res, {
            end: true
        });
    });

    proxy.on('error', (e) => {
        console.error("Error during forwarding", e);
    });

    client_req.pipe(proxy, {
        end: true
    });
}

Executing this code I am getting:

Error during forwarding { Error: socket hang up
    at createHangUpError (_http_client.js:253:15)
    at Socket.socketOnEnd (_http_client.js:345:23)
    at emitNone (events.js:91:20)
    at Socket.emit (events.js:185:7)
    at endReadableNT (_stream_readable.js:974:12)
    at _combinedTickCallback (internal/process/next_tick.js:80:11)
    at process._tickCallback (internal/process/next_tick.js:104:9) code: 'ECONNRESET' }

I am thinking the problem might be that the source host is a https url and the proxy is currently listening for http. Could anyone help me out here?

I have been playing around with the node-http-proxy module as well, but what bugs me is that the options object is different in that module, so I don't know how to add the client certificate and key.

via Jakob Abfalter