Fun with NodeJS

browserloop.js

var http = require('http');

function parseSwitch(req){
  var list = {},
  rc = req.headers.cookie;
  rc && rc.split(';').forEach(function( cookie ) {
    var parts = cookie.split('=');
    list[parts.shift().trim()] = unescape(parts.join('='));
  });
  return list;
};

http.createServer(function (req, res) {
  var sw = parseSwitch(req);
    if(sw.Switch == 1){
      res.writeHead(200, {
        'Content-Type': 'text/html',
        'Set-Cookie': 'Switch=2'
      });
      res.write('<script type="text/javascript">window.location = "' + req.url + 'b' + '"</script>');
    }
    else {
      res.writeHead(200, {
        'Content-Type': 'text/html',
        'Set-Cookie': 'Switch=1'
      });
      res.write('<script type="text/javascript">window.location = "' + req.url + 'a' + '"</script>');
    };
  req.on('error', function(e) {
    console.log('problem with request: ' + e.message);
  });
  console.log(req.connection.remoteAddress + ' going to ' + req.url);
  res.end('\n<h1>Isn\'t this fun?</h1>\n');
}).listen(80, '0.0.0.0');
console.log('Server has started...');