proxy.js

var http = require('http'),
  request = require('request');

var prodServer = process.env.PROD_SERVER
var target = process.env.TARGET

var app = http.createServer(function (req, resp) {
  var origin;
  if (req.headers.origin.match(/(localhost|\.dev|\.local)\:\d+$/)) {
    origin = req.headers.origin;
  } else {
    origin = prodServer;
  }

  resp.setHeader("Access-Control-Allow-Origin", origin);
  resp.setHeader("Access-Control-Allow-Headers", "X-Requested-With,Authorization,Content-Type");

  if (req.method === "OPTIONS") {
    resp.statusCode = 200;
    resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS");
    resp.end()
  } else {
    req.headers.host = target;
    req.pipe(request("https://" + target + req.url)).pipe(resp);
  }
});

var port = process.env.PORT || 5001;
app.listen(port, function () {
  console.log("Listening on " + port);
});