node cors proxy

package.json

{
  "dependencies": {
    "http-proxy": "^1.12.0"
  }
}

proxy.js

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

var proxy = httpProxy.createProxyServer({ target: 'http://some-host:9999' });

proxy.on('proxyReq', function (proxyReq, req, res, options) {
  proxyReq.setHeader('host', options.target.host);
});

proxy.on('proxyRes', function (proxyRes, req, res) {
  res.setHeader('Access-Control-Allow-Origin', '*');
});

proxy.listen(1234);