问(Nodejs + Angular 6+ socket.io)中的CORS问题

EN

Access to XMLHttpRequest at 'http://********.com/socket.io/?EIO=3&transport=polling&t=N3jTiAZ' from origin 'http://localhost:4200' has been blocked by CORS policy: 

The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'.

 The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.

const express = require('express');
const bodyParser = require('body-parser');
const app = express();
const server = require('http').createServer(app);
const conn = app.listen("3000")
const io = require('socket.io').listen(conn);

io.origins('*:*') 

var connectioncheck = io.of('/check-connection');
connectioncheck.on('connection', function (socket) {
   console.log('user  connected');
});

   <script src="https://cdn.jsdelivr.net/npm/socket.io-client@2/dist/socket.io.js"></script>
var socket = io.connect('http://********.com/check-connection');
socket.emit('connection', "hello",function(db){
        console.log(db);
        console.log("data from callback");
    });