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I recently started learning node.js and socket.io. I followed a simple tutorial that socket.io had and it all worked fine while running on my computer. However, I decided to upload the client part to a server for testing and that is where the problems began. I would like to run the chat client on a web host, and run the server on my computer, or another host. Basically, I plan on port forwarding the server, and having the client run on a web page. I opened my port to port forward and it seems to be working, however I am getting the error on the web page every time.
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://24.151.51.34:3000/socket.io/?EIO=3&transport=polling&t=1437399007343-0. (Reason: CORS request failed).
I've been messing around with the code in hopes of finding a solution to this problem before starting my own project, however I can't figure out a way. The client code is :
<!doctype html>
<html>
<head>
<title>Socket.IO chat</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font: 13px Helvetica, Arial; }
form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
#messages { list-style-type: none; margin: 0; padding: 0; }
#messages li { padding: 5px 10px; }
#messages li:nth-child(odd) { background: #eee; }
</style>
</head>
<body>
<ul id="messages"></ul>
<form action="">
<input id="m" autocomplete="off" /><button>Send</button>
</form>
<script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>
<script src="http://code.jquery.com/jquery-1.11.1.js"></script>
<script>
var socket = io('24.151.51.34:3000');
$('form').submit(function(){
socket.emit('chat message', $('#m').val());
$('#m').val('');
return false;
});
socket.on('chat message', function(msg){
$('#messages').append($('<li>').text(msg));
});
</script>
</body>
</html>
For the server code I tried to add code to allow CORS but really not sure what to do :
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
io.set('origins', 'http://browsercombat.com:80');
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
res.header("Access-Control-Allow-Methods", "POST, GET, PUT, DELETE, OPTIONS");
res.header("Access-Control-Allow-Credentials", "true");
next();
});
app.get('/', function(req, res, next) {
res.sendFile(__dirname + '/index.html');
});
app.post('/', function(req, res, next) {
// Handle the post for this route
});
io.on('connection', function(socket){
socket.on('chat message', function(msg){
io.emit('chat message', msg);
});
});
http.listen(3000, function(){
console.log('listening on *:3000');
});
203
Besides using cors package, I managed to fix it by adding options to the socketio creation. Starting from the version 3 cors config has changed and you have to add these options. Worked on socket version 2.x.x also.
const io = socketio(httpServer, {
cors: {
origin: "http://localhost:3000",
methods: ["GET", "POST"],
credentials: true
}
});
Here is the resource https://socket.io/docs/v3/handling-cors/
Bonus: In case you encounter Bad Request make sure you have the same version of socket.io for the client and the server.
184
I managed to solve the problem by using this CORS middle ware someone recommended me and checking my firewall settings. https://www.npmjs.com/package/cors
41
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