GET http://localhost/socket.io/?EIO=3&transport=polling&t=LjIvLGU 404 (Not Found)
Question
I have a problem with Nodejs and my js code.
When I run the Nodejs in console server does not show any problems, but all time I get an error in the console from Chrome:
GET http://localhost/socket.io/?EIO=3&transport=polling&t=LjIvLGU 404 (Not Found)
index.html
<head>
<title>test</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="http://localhost:3000/socket.io/socket.io.js"></script>
</head>
script.js
var express = require('express');
var app = express();
var server = require('http').Server(app);
var io = require('socket.io').listen(server);
users = [];
connections = [];
server.listen(process.env.PORT || 3000);
console.log("server up");
app.get('/', function (req, res) {
res.sendFile(__dirname + '/index.php');
});
io.sockets.on('connection', function (socket) {
socket.on('subscribe', function (data) {
socket.join(data.room);
});
socket.on('arriv', function (data) {
console.log(data);
io.sockets.in('invitor').emit('send message',data);
});
socket.on('unsubscribe', function (data) {
socket.leave(data.room);
});
});
user.js
$(function () {
var cid = $.session.get('company');
console.log(cid);
var socket = io.connect();
socket.emit("subscribe", {room: "invitor"});
socket.on("send message", function (data){
$('#info').append("" + data.gid + "</br>");
});
$(document).on('click', '.123', function () {
var gid = $(this).attr('id');
socket.emit('arriv', {gid: gid});
});
});
3 answers
solution1
2 2017-04-09 16:52:22
It seems that you are trying to connect your socket somewhere else over localhost without port 3000. If i test your code snippets everything is OK. Your error message shows me that port 3000 is missing " GET http://localhost/socket.io/?EIO=3&transport=polling&t=LjIvLGU 404 (Not Found)" .
You can try to connect manually if you change your io.connect to var socket = io.connect('http://localhost:3000');
solution2
1 2018-03-17 17:47:50
" GET http://localhost/socket.io/?EIO=3&transport=polling&t=LjIvLGU 404 (Not Found)" means you have socket.io is not listening to your intended server. My mistake was that I instantiated the wrong server object.
In app.js file
var server = app.listen(config.dev.port, () => {
console.log("Listening ..");
});
var io = require('socket.io').listen(server);
solution3
1 2020-10-28 16:36:02
After a lot of searching, this works:
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io('http://localhost:3000/');
</script>
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