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Why I got so many connection events on Node's HTTP server?

Tag: javascript,node.js,http,websocket,socket.io

I have a web application using socket.io. It runs on localhost:8000 on my local machine. In order to find an annoying resource leak in my application, I tried to log out the connection events on my HTTP server:

server.on('connection', function(conn) {
    //log out connection details
});

When I open the page inside my browser after the page loads, I can see multiple connection events in the log - something like these:

connection established: 127.0.0.1:54148
connection established: 127.0.0.1:54149
connection established: 127.0.0.1:54146
connection established: 127.0.0.1:54152
connection established: 127.0.0.1:54144
connection established: 127.0.0.1:54155

The strange thing is that I don't create a WebSocket connection after page load - only if the user clicks on a button. But I haven't clicked on any button and I still see these strange connections.

If I click on my button to connect with socket.io to my server, the log shows a new connection:

connection established: 127.0.0.1:54155

Fortunately every connections which I saw in the log were closed after some time - so I guess it couldn't be the reason of my resource leak.

But I'm still curious: what causes these connection events? And why is the port number so strange (not 8000 on which my server listens)?

Edit:

My server config is not a special one. In server.js:

var express = require('express');
var app = express();
var server = require('http').Server(app);
var io = require('socket.io')(server);
var configSettings = require('./configSettings');

var socketIOServer = require('./server/socketServer')(io); // config socketServer
require('./server/static.js')(app, express); // static middleware
require('./server/routes.js')(app, configSettings); // routes

exports = module.exports = server;

exports.use = function() {
     app.use.apply(app, arguments);
};

exports.configSettings = configSettings;

In start.js:

var server = require('./server');

var port = server.configSettings.serverPort;
var serverIpAddress = server.configSettings.serverIpAddress;
server.listen(port, serverIpAddress);

Best How To :

The connections you're logging from the HTTP server are to be expected and are related to the resources that are being used on your HTML pages (JS, CSS, images, favicon, etc).

The port numbers you're logging are the client side port numbers. While not random, they will change for every new connection that's being set up to your server. After the resource has been delivered to the client (and depending on keep alive, some extra time), the connection will be closed.

In general, Node can handle thousands of concurrent connections.

This obviously doesn't solve your resource leak, but it explains the connection events you're seeing.

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