Ember CLI proxy to a POW server

Question

How can I get EmberCLI to proxy to a POW server? I'm using ember-cli master with the new explicit proxies (https://github.com/stefanpenner/ember-cli/pull/1530). This for example doesn't work:

var Proxy = require('http-proxy');

// For options, see:
// https://github.com/nodejitsu/node-http-proxy
var proxy = Proxy.createProxyServer({});

module.exports = function(app) {

  app.use('/', function(req, res, next){
    proxy.web(req, res, { target: 'http://api.mywebsite.dev' });
  })

};

However, if I change my target to localhost, everything works fine:

var Proxy = require('http-proxy');

// For options, see:
// https://github.com/nodejitsu/node-http-proxy
var proxy = Proxy.createProxyServer({});

module.exports = function(app) {

  app.use('/', function(req, res, next){
    proxy.web(req, res, { target: 'http://localhost:9292' });
  })

};