A node.js proxy that accepts HTTP and HTTPS traffic on the same port.

http-and-https-proxy.js

var fs = require('fs');
var net = require('net');
var http = require('http');
var https = require('https');

var httpAddress = '/path/to/http.sock';
var httpsAddress = '/path/to/https.sock';
fs.unlinkSync(httpAddress);
fs.unlinkSync(httpsAddress);

var httpsOptions = {
  key: fs.readFileSync('/path/to/key.pem'),
  cert: fs.readFileSync('/path/to/cert.pem')
};

net.createServer(tcpConnection).listen(8000);
http.createServer(httpConnection).listen(httpAddress);
https.createServer(httpsOptions, httpsConnection).listen(httpsAddress);

function tcpConnection(conn) {
  conn.once('data', function(buf) {
    // A TLS handshake record starts with byte 22.
    var address = (buf[0] === 22) ? httpsAddress : httpAddress;
    var proxy = net.createConnection(address, function() {
      proxy.write(buf);
      conn.pipe(proxy).pipe(conn);
    });
  });
}

function httpConnection(req, res) {
  res.writeHead(200, { 'Content-Length': '4' });
  res.end('HTTP');
}

function httpsConnection(req, res) {
  res.writeHead(200, { 'Content-Length': '5' });
  res.end('HTTPS');
}

This is error generator.
Please add to code:
conn.on("error", err => console.error(err) );

The better code is in the second answer to:
https://stackoverflow.com/questions/22453782/nodejs-http-and-https-over-same-port

But it also returns the same error: write EPIPE (or read ECONNRESET)