Node.js server push example

serverpush.js

var http = require('http');

var listener;

http.createServer(function (request, response) {

  if (request.url === '/listen') {
    listener = response;
    return;
  }
  
  if (request.url.indexOf('/event') === 0  &&  listener !== undefined) {
    listener.writeHead(200, {'Content-Type': 'text/plain'});
    listener.write('Event: ' + request.url.slice(7))
    listener.end();
    listener = undefined;
  }
  
  response.end()

}).listen(8080);