How to use http and WebSocket in CocosCreator

//Access address let url = "http://127.0.0.1:3000/?url=123&name=321";
//Create a new Http
let xhr = new XMLHttpRequest();
//Receive data xhr.onreadystatechange = function () {
    if (xhr.readyState == 4 && (xhr.status >= 200 && xhr.status < 400)) {
        var response = xhr.responseText;
        console.log(response);
    }
};
//Error handling xhr.onerror = function(evt){
    console.log(evt);
}
//Initialize a request, GET method, true asynchronous request xhr.open("GET", url, true);
//Send request xhr.send();

var app = require('express')(); 
var http = require('http').Server(app);  
 
 
app.get('/', function(req, res){ 
    //Set the domain name allowed to cross domain, * represents allowing any domain name to cross domain res.header("Access-Control-Allow-Origin","*");
    //Allowed header types res.header("Access-Control-Allow-Headers","content-type");
    //Cross-domain allowed request methodres.header("Access-Control-Allow-Methods","DELETE,PUT,POST,GET,OPTIONS");
    res.send(req.query.name); 
}); 
   
http.listen(3000, function(){ 
    console.log('listening on *:3000'); 
});

console.log(response); //output is 321

let url = "http://127.0.0.1:3000/";
let xhr = new XMLHttpRequest();
 
xhr.onreadystatechange = function () {
    if (xhr.readyState == 4 && (xhr.status >= 200 && xhr.status < 400)) {
        var response = xhr.responseText;
        console.log(response);
    }
};
xhr.onerror = function(evt){
    console.log(evt);
}
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send("name=123");

var app = require('express')(); 
var http = require('http').Server(app);  
var querystring = require('querystring');
 
 
app.post('/', function(req, res){ 
    //Set the domain name allowed to cross domain, * represents allowing any domain name to cross domain res.header("Access-Control-Allow-Origin","*");
    //Allowed header types res.header("Access-Control-Allow-Headers","content-type");
    //Cross-domain allowed request methodres.header("Access-Control-Allow-Methods","DELETE,PUT,POST,GET,OPTIONS");
     
    var body = "";
     
    req.on('data', function (chunk) {
        body += chunk; //Be sure to use +=, if body=chunk, because favicon.ico is requested, body will be equal to {}
        console.log("chunk:",chunk);
    });
     
    req.on('end', function () {
        body = querystring.parse(body);
        console.log("body:",body);
        res.send(body.name);
    });
}); 
   
http.listen(3000, function(){ 
    console.log('listening on *:3000'); 
});

console.log(response); //output 123

let ws = new WebSocket("ws://127.0.0.1:8001");
ws.onopen = function (event) {
    console.log("Send Text WS was opened.");
};
ws.onmessage = function (event) {
    console.log("response text msg: " + event.data);
};
ws.onerror = function (event) {
    console.log("Send Text fired an error");
};
ws.onclose = function (event) {
    console.log("WebSocket instance closed.");
};
 
setTimeout(function () {
    if (ws.readyState === WebSocket.OPEN) {
        console.log("WebSocket start sending message.");
        ws.send("Hello WebSocket, I'm a text message.");
    }
    else {
        console.log("WebSocket instance wasn't ready...");
    }
}, 3000);

var ws = require("nodejs-websocket");
  
console.log("Start creating websocket");
var server = ws.createServer(function(conn){
    console.log("Connection successful");
    conn.on("text", function (obj) {
       console.log("Receive:",obj);
        conn.send("message come from server");     
          
    })
    conn.on("close", function (code, reason) {
        console.log("Close connection")
    });
    conn.on("error", function (code, reason) {
        console.log("Abnormal closure")
    });
}).listen(8001)
console.log("Start creating websocket");