CODEWITHSUNDEEP
javascriptnode.jssocketswebsocketsocket.io
Cetus
Cetus

Reputation: 55

CORS issue with socket.io

Needing a websocket with my website, I wanted to use socket.io.

However, I am experiencing a CORS issue:

Access to XMLHttpRequest at 'http://localhost:2021/socket.io/?EIO=4&transport=polling&t=NlbFGS2' from origin 'http://localhost:63341' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
polling-xhr.js:202 

GET http://localhost:2021/socket.io/?EIO=4&transport=polling&t=NlbFGS2 net::ERR_FAILED

So I found this code on the socket.io site that I tried but I still have the same problem...

const app = require('express')();
const http = require('http').createServer(app);
const io = require("socket.io")(http, {
    cors: {
        origin: ["http://localhost:63341/"],
        methods: ["GET", "POST"]
    }
})

And here is the code on the client side:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/socket.io.msgpack.min.js"></script>
<script>
    let socket = io('http://localhost:2021')
</script>

Upvotes: 3

Views: 2569

Answers (4)

Sairungrawee Navamachiti
Sairungrawee Navamachiti

Reputation: 33

You can use this code to fix the problem: This code allows all origins to connect, * means allowing everything. WARNING: DO NOT DO THIS IN PRODUCTION, BECAUSE THERE WILL BE SECURITY RISKS

const server = require('http').createServer();
const io = require('socket.io')(server,{
    cors: { origin : "*"}
});

Upvotes: 1

Prerna Kakria
Prerna Kakria

Reputation: 87

// at server side
const io = require('socket.io')(http, {
  cors: {
    origin: "http://localhost:4200",
    methods: ["GET", "POST"],
    credentials: true
  }
});

// at client side
  this.socket = io('http://localhost:5000', {
      withCredentials: true
    });

replace http://localhost:4200 with your url

Upvotes: 1

Daniel
Daniel

Reputation: 1472

You could use this to just allow anything to connect... Don't do this in production though.

export const io = new Server(http, {
  cors: { origin: "*" },
});

Upvotes: 2

Shariful Islam Mubin
Shariful Islam Mubin

Reputation: 2286

Follow these steps on your backend server:

  1. Run npm install cors

  2. Add this code after creating app:

    app.use(cors({
    origin: "http://localhost:63341"
}))

  3. Restart your server and check if it works or not.

  4. If it still doesn't work, then change your line 3 with this:

    const io = require("socket.io")(http); // no cors configuration.

Upvotes: 2

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