cors error

I want to connect client web page for socketIO and admin-ui to socketIO server.
But the error appears.

When I use this code below, the client web disconnects with cors error.

const io = new Server(httpServer, {
cors: {
origin: "https://admin.socket.io",
},
});
instrument(io, {
auth: false,
});

Of course, I did like this, and "xhr poll error" happens on admin-ui.

const io = new Server(httpServer, {
cors: {
origin: "", // and I did ["https://admin.socket.io",""] instead of this
},
});
instrument(io, {
auth: false,
});

does admin-ui supports only local environment?

It seems you are missing the credentials: true part:

const { createServer } = require("http");
const { Server } = require("socket.io");
const { instrument } = require("@socket.io/admin-ui");

const httpServer = createServer();

const io = new Server(httpServer, {
  cors: {
    origin: ["https://admin.socket.io"],
    credentials: true
  }
});

instrument(io, {
  auth: false
});

httpServer.listen(3000);

Reference: https://socket.io/docs/v4/admin-ui/#server-side

Could you please check?

It seems you are missing the credentials: true part:

const { createServer } = require("http");
const { Server } = require("socket.io");
const { instrument } = require("@socket.io/admin-ui");

const httpServer = createServer();

const io = new Server(httpServer, {
  cors: {
    origin: ["https://admin.socket.io"],
    credentials: true
  }
});

instrument(io, {
  auth: false
});

httpServer.listen(3000);

Reference: https://socket.io/docs/v4/admin-ui/#server-side

Could you please check?

My mistake. The line "credentials: true" is not there, but I wrote it already.

@GeonwooDev have you eventually found a solution?

@darrachequesne

@darrachequesne No, I'm not using admin-ui, but only socketIO.

any updates on this?

@MehdiMamas

@MehdiMamas unfortunatly I am not able to reproduce the issue.

From my understanding there are two possible explanations:

either the cors configuration is incorrect (which does not seem to be the case here)
or the UI is not able to reach the Socket.IO server

Could you please share what gets printed to the console?

did you find the answer

Getting error as well.

docs: add some examples of CORS configuration

I have added a few examples in the documentation about the cors option: https://socket.io/docs/v4/server-options/#cors

Does that help?

same issue here.
even with origin: "*" im getting GET http://localhost:8080/socket.io/?EIO=4&transport=polling&t=Oyga8kN net::ERR_FAILED 404 (Not Found)

I have also tried everything in this thread, to no avail.

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cors error #35

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darrachequesne commented on Feb 17, 2022

GonnaWooh commented on Feb 18, 2022

darrachequesne commented on Jun 23, 2022

GonnaWooh commented on Jul 7, 2022

MehdiMamas commented on Sep 18, 2022

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