this.js

server.mount(function(req) {
  if ( !req.headers['x-forwarded-for'] && /\/s.gif|\/s.json/.test(req.url) === true ) {
    return true;
  }
  return false;
}, function(req, bounce) {

  var subdomains = /(www\.|count\.)/;
  var matches = req.headers.host.match(subdomains);

  var host;
  if (matches) {
    host = req.headers.host.replace(matches[1], '');
  } else {
    host = req.headers.host;
  }

  var url = host + '/pb' + req.url;
  bounce(url);
});