JavaScript EventSource SSE not firing in browser

Question

I have been developing a nodejs server to provide server-side-events for a new website I am developing in HTML5.

When I telnet to the server it works correctly, send

Answer 1

I modified your server-side script, which 'seems' partly works for Chrome.
But the connection break for every 2 broadcast & only 1 can be shown on client.

Firefox works for 1st broadcast and stop by this error:

Error: The connection to /sse was interrupted while the page was loading.

And Chrome will try to reconnect and received 3rd broadcast.

I think it's related to firewall setting too but can't explain why sometime will works.

Note: For event listener of response (line 10), 'close' & 'end' have different result,
You can try it and my result is [close: 1 success/2 broadcast] & [end: 1 success/8 broadcast]

var http = require('http'), fs = require('fs'), requests = [];

var server = http.Server(function(req, res) {
  var clientIP = req.socket.remoteAddress;
  var clientPort = req.socket.remotePort;
  if (req.url == '/sse') {
    var allClient="";for(var i=0;i=0; i--) {
          if ((requests[i].ip == clientIP) && (requests[i].port == clientPort)) {
            requests.splice(i, 1);
          }
        }
      });
    }
  }else{
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.write(fs.readFileSync('./test.html'));
    res.end();
  }
});
server.listen(80);

setInterval(function test() {
  broadcast('poll', "test message");
}, 500);

var broadcastCount=0;
 function broadcast(rtype, msg) {
    if(!requests.length)return;
    broadcastCount++;
    var lines = msg.split("\n");
    for(var i = requests.length - 1; i >= 0; i--) {
        requests[i].res.writeHead(200, {
            'Content-Type': 'text/event-stream',
            'Cache-Control': 'no-cache',
            'Connection': 'keep-alive'
        });
        requests[i].res.write("event: " + rtype + "\n");
        for(var j = 0; j < lines.length; j++) {
            if(lines[j]) {
                requests[i].res.write("data: " + lines[j] + "\n");
            }
        }
        requests[i].res.write("data: Count\: " + broadcastCount + "\n");
        requests[i].res.write("\n");
    }
    console.log("Broadcasted " + broadcastCount + " times to " + requests.length + " user(s).");
 }