simple node client server communication not working using express and socket.io
Question
I'm trying to write a simple client server application.
That's the HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.0.1/socket.io.js"></script>
<script src="client.js"></script>
</body>
</html>
server.js file:
const express = require('express');
const app = express();
const port = 3000;
const server = app.listen(port);
const io = require('socket.io')(server);
app.get('/', (req, res) => {
res.send('Hello World!');
});
io.on('connection', (socket) => {
console.log('a user connected');
});
client.js file:
const socket = io('https://localhost:3000/');
At this moment if I start the server by typing node server on the terminal and I open the HTML file using the LiveServer vs extension, the console doesn't show the text a user connected , it also returns an error which is:
GET https://localhost:3000/socket.io/?EIO=4&transport=polling&t=NdZ4wOd net::ERR_SSL_PROTOCOL_ERROR
I don't know what I'm doing wrong.
2 answers
solution1
0 2021-06-07 03:04:47
In the client.js file you could try const socket = io.connect(); and I'm not sure but i think <script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.0.1/socket.io.js"></script> Should be in the header but i could be wrong about that.
solution2
0 2021-06-07 04:57:06
**Make Changes In Your Server File **
const express = require('express');
const cors = require('cors');
const app = express();
const port = 3000;
app.use(cors());
const server = app.listen(port);
const io = require('socket.io')(server);
app.get('/', (req, res) => {
res.send('Hello World!');
});
io.on('connection', (socket) => {
console.log('a user connected');
});
Install cors npm package before starting your server using npm i cors
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