socket.IO- why can't my client html page load socket.io.js?

Question

My server structure is simple. I have a public folder at the same level as my app.'s

app.js node_modules(folder) express(folder) socket.io(folder) public(folder) index.html js(folder) css(folder)

My app.'s is as follows

var sys = require('sys'), express = require('express'), app = express.createServer('127.0.0.1'), io = require('socket.io'); app.use(express.static(__dirname + '/public')); app.get('/', function (req, res) { res.send('Hello World'); }); app.listen(3000); var socket = io.listen(app); socket.on('connection', function (client){ // new client is here! });

And my html page(simplified) is

<html> <p id="text">socket.io</p> <script src="/socket.io/socket.io.js"></script> <script type="text/javascript" src="js/lib/jquery-1.4.2.min.js"></script> </html>

When I run the server and load my index.html, socket.io.js is NOT found, a 404 error is generated. What gives? In my case does socket.IO have to be installed globally?

Does socket.io.js exist in the folder /public/socket.io/ ? — adeneo
– adeneo, Commented Dec 6, 2013 at 19:11
Two things. (1) What happens if you remove the leading / from "/socket.io/socket.io". (2) I've got a working example described in this answer that might help you: stackoverflow.com/a/20426209/446681 — Hector Correa
– Hector Correa, Commented Dec 6, 2013 at 19:19
One more thing, file socket.io.js does not have to be in the public folder. This request is automatically processed by socket.io on the server as indicated in this other answer: stackoverflow.com/a/19521970/446681 — Hector Correa
– Hector Correa, Commented Dec 6, 2013 at 19:27

robertklep · Accepted Answer · 2013-12-06 19:53:57Z

Try this:

var sys = require('sys'), express = require('express'), app = express(), io = require('socket.io'); app.use(express.static(__dirname + '/public')); app.get('/', function (req, res) { res.send('Hello World'); }); var server = app.listen(3000); var socket = io.listen(server); socket.on('connection', function (client){ // new client is here! });

Some explanation:

express.createServer is deprecated, with Express 3 you run express() to instantiate Express;
io.listen should be passed an http.Server instance, whereas you were passing it an Express instance (a http.Server instance is returned by app.listen(...));
there's not need to put the socket.io.js file anywhere; socket.io installs a handler which watches for requests for that file, and will serve it automatically;

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