Sample node server that sends chunked script tags.

long-lived.js

var http = require('http');

var server = http.createServer(function (req, res) {
  res.writeHead(200, { 'content-type': 'text/html' });
  res.write('<script>console.log("this is the start of the stream...")</script>');

  var timer = setInterval(function () {
    if (!res.connection || !res.connection.writable) {
      try { res.end(); } catch (e) {}
      clearInterval(timer);
      console.log('closed');
      return;
    }
    res.write('<script>console.log("and now more messages...")</script>');
  }, 2000);

  // importantly, res.end() is never called.
});

server.listen(8080);