websocket proxy nodejs

proxy.js

// proxies requests to /folder to / on 8081
// proxies requests to /folder2 to /folder2/ on 8081
// all other requests sent to 8080
// listens on 80 
 
var http = require('http');
 
//2 dependencies, install them
var proxyRules = require('http-proxy-rules')
var websocket = require('http-proxy');
 
var rules = new proxyRules({
    //rules work like nginx or apache rules, just regex
    rules: {
        '/folder(.*)': 'http://localhost:8081$1', //app sees '/ + req'
        '(/folder2.*)': 'http://localhost:8082$1' //app sees '/folder2/ + req' 
        },
      default: 'http://localhost:8080' // default target like main site
})
 
var server = websocket.createProxy();
 
server.on('error', function(err,req,res) {
    console.log(' - ', err);
  });
 
 
http.createServer(function(req, res) {
 
    // match method comes from proxy rules to test rules
    var target = rules.match(req);
    if (target) {
        console.log('GET', req.url)
        return server.web(req, res, {
        target: target
      });
    }
    
    // if that didn't work we fkd up
    res.writeHead(500, { 'Content-Type': 'text/plain' });
    res.end('Internal Server Error');
    
  }).listen(80);