server.js

// Heroku defines the environment variable PORT, and requires the binding address to be 0.0.0.0
var host = process.env.PORT ? '0.0.0.0' : '127.0.0.1';
var port = process.env.PORT || 8080;

// Grab the blacklist from the command-line so that we can update the blacklist without deploying
// again. CORS Anywhere is open by design, and this blacklist is not used, except for countering
// immediate abuse (e.g. denial of service). If you want to block all origins except for some,
// use originWhitelist instead.
var originBlacklist = (process.env.CORSANYWHERE_BLACKLIST || '').split(',');

var cors_proxy = require('./lib/cors-anywhere');
cors_proxy.createServer({
  originBlacklist: originBlacklist,
  requireHeader: ['origin', 'x-requested-with'],
  removeHeaders: [
    'cookie',
    'cookie2',
    // Strip Heroku-specific headers
    'x-heroku-queue-wait-time',
    'x-heroku-queue-depth',
    'x-heroku-dynos-in-use',
    'x-request-start',
  ],
  redirectSameOrigin: false,
  httpProxyOptions: {
    // Do not add X-Forwarded-For, etc. headers, because Heroku already adds it.
    xfwd: false,
  },
}).listen(port, host, function() {
  console.log('Running CORS Anywhere on ' + host + ':' + port);
});