'Elephant.io server error with Php( An error occurred while trying to establish a connection to the server)

I have a question for you, I'm using socket.io and elephant.io in my php application, but I've been dealing with the error I got by elephant.io for almost 2 days. Is there something I did wrong? Below are the errors and codes I got.

MY ERROR enter image description here

MY INDEX.PHP

require __DIR__ . '/vendor/autoload.php';

use ElephantIO\Client;
use ElephantIO\Engine\SocketIO\Version2X;

$client = new Client(new Version2X('http://localhost:9090'));
$client->initialize();
$client->emit('send-message', [
    'name' => 'john',
    'surname' => 'doe'
]);
$client->close();

MY APP.JS

const server = require('http').createServer();
const io = require('socket.io')(server,{
    cors: {
        origin: "*",
    }
});
io.on('connection',function (socket){
    console.log('connected');
   socket.on('send-message',function (data){
       console.log(data);
       io.emit('message',data);
   })
   socket.on('disconnect',function (){
       console.log('disconnected')
   })
})
server.listen(9090);

MY SOCKET.HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.2.0/socket.io.js" 
integrity="sha512-WL6WGKMPBiM9PnHRYIn5YEtq0Z8XP4fkVb4qy7PP4vhmYQErJ/dySyXuFIMDf1eEYCXCrQrMJfkNwKc9gsjTjA==" 
crossorigin="anonymous" referrerpolicy="no-referrer"></script>

<script>
var socket = io('http://localhost:9090');
socket.on('message',function (data){
    console.log(data);
});
socket.emit('send-message',{
    "name":"johnHTML",
    "surname": "doeHTML"
});
</script>
</body>
</html>
phpnode.jssocket.io


Solution 1:[1]

I had this error once. I searched like you but couldn't find it. I tried many different methods, none of them worked. As a last resort I changed the version of the "socket.io" library to 2.2.0 and it worked. you should try this

Solution 2:[2]

You can use this updated code of elephant.io without downgrading your socket version. it supports socket version more than 3

https://github.com/tohenk/elephant.io

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 thecodepanda
Solution 2 hiren.viradia

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