server.js

// Listen on a specific host via the HOST environment variable
var host = process.env.HOST || '0.0.0.0';
// Listen on a specific port via the PORT environment variable
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 = parseEnvList(process.env.CORSANYWHERE_BLACKLIST);
var originWhitelist = parseEnvList(process.env.CORSANYWHERE_WHITELIST);
var requireHeader = parseEnvList(process.env.CORSANYWHERE_REQUIREHEADER);
var removeHeaders = parseEnvList(process.env.CORSANYWHERE_REMOVEHEADERS);
function parseEnvList(env) {
  if (!env) {
    return [];
  }
  return env.split(',');
}

// Set up rate-limiting to avoid abuse of the public CORS Anywhere server.
var checkRateLimit = require('./lib/rate-limit')(process.env.CORSANYWHERE_RATELIMIT);

var cors_proxy = require('./lib/cors-anywhere');
cors_proxy.createServer({
  originBlacklist: originBlacklist,
  originWhitelist: originWhitelist,
  requireHeader: requireHeader,
  checkRateLimit: checkRateLimit,
  removeHeaders: removeHeaders,
  redirectSameOrigin: true
}).listen(port, host, function() {
  console.log('Running CORS Anywhere on ' + host + ':' + port);
});