CORS Error on 15:00

[tsensei]

On the video (one at brad traversys channel), around 15:00 seconds, while making the request from index.js , we are getting a cors error. The probable reason for this error maybe the current version of 4.1.2 and the version in client code is 2.3.0. I got the solution from one of the comments that reinstalling the older version solves the problem or you may include cors header while initializing socket. Maybe you should pin the comment or give any solution to this

[jimmirra]

As of version 3.0 of socket.io, you need to explicitly enable CORS. documentaion

const http = require("http");
const socket_io = require("socket.io");

const httpServer = http.createServer();
const io = new socket_io.Server(httpServer, {
  cors: {
    origin: "http://127.0.0.1:8080",
  },
});

[i-am-darshil]

This helps to solve cors and 400 Bad Request Issue

const httpServer = require("http").createServer();
const io = require('socket.io')(httpServer,{
  cors: {
          origin: "http://127.0.0.1:5500",
          methods: ["GET", "POST"],
          credentials: true,
          transports: ['websocket', 'polling'],
  },
  allowEIO3: true
  })