socket.io uest at 'http://localhost:3005/socket.io/?EIO=3&transport=polling&t=NSH7T-B' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. code example

Example 1: socket io with cors

const io = require("socket.io")(httpServer, 
  { 
  cors: {    
    origin: "*",    
    methods: ["GET", "POST"]  
  }});

Example 2: socket.io cors

const io = require("socket.io")(httpServer, {  cors: {    origin: "http://localhost:8080",    methods: ["GET", "POST"]  }});httpServer.listen(3000);