Node Express cors proxy route

cors.js

var request = require('request');

app.all(/^\/cors\/(.*)$/, function (req, res, next) {
  // Set CORS headers: allow all origins, methods, and headers: you may want to lock this down in a production environment
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Methods", "GET, PUT, PATCH, POST, DELETE");
  res.header("Access-Control-Allow-Headers", req.header('access-control-request-headers'));

  if (req.method === 'OPTIONS') {
    // CORS Preflight
    res.send();
  } else {
    var targetURL = 'http://' + req.params[0];
    if (!targetURL) {
      res.send(500, { error: 'No URL supplied to proxy to.' });
      return;
    }
    request({ url: targetURL, method: req.method, json: req.body, qs:req.query, headers: {'Authorization': req.header('Authorization')} },
      function (error, response, body) {
        if (error) {
          console.error('error: ' + response.statusCode)
        }
      }).pipe(res);
  }
});