Node Reverse Proxy with Express

node-reverse-proxy.js

var fs = require('fs');
var express = require('express');
var request = require('request');

var apiUrl = 'http://example.com'; // remote host

var app = express();

// replace specific requests
app.get('/Scripts/js.js', function(req, res, next) {
  console.log(req.url, req.query, 'script modified!');
  fs.createReadStream(__dirname+'/js.js').pipe(res);
});

app.use(function(req, res) {
  console.log(req.url, req.query);
  var url = apiUrl + req.url;
  var proxy = request({
    method: req.method,
    url: url,
    qs: req.query,
    headers: req.headers
  });
  req.pipe(proxy);
  proxy.pipe(res);
});

var server = app.listen(8575); // change port