EventSource server with nodejs

server.js

var http = require('http')
  , fs   = require('fs')
  , PORT = process.argv[2] || 8080
  , HOST = process.argv[3] || '127.0.0.1';


http.createServer(function (req, res) {
   if (req.url == '/events') {
      res.writeHead(200, { 'Content-Type'  : 'text/event-stream'
                         , 'Cache-Control' : 'no-cache'
                         , 'Connection'    : 'keep-alive'
                         });
      console.log('Client connect');

      var t = setInterval(function () {
         console.log('Send data');
         res.write('data: DATA\n\n');
      }, 1000);

      res.socket.on('close', function () {
         console.log('Client leave');
         clearInterval(t);
      });

   } else {
      res.writeHead(200, {'Content-Type': 'text/html'});
      res.write(fs.readFileSync(__dirname + '/templates/index.html'));
      res.end()
   }
}).listen(PORT, HOST);

'Connection' : 'keep-alive' - What for?

@Yaffle You need to keep the connection alive in order to receive the events, that's the whole point of EventSource