server.js

const http = require("http");

const server = http.createServer((req,res)=>{
    console.log("request came", req.url);
    // faking 1 sec amount of work
    setTimeout(()=>{
        console.log("response sent", req.url);
        res.writeHead(200, { 'Content-Type': 'text/plain' });
        res.end('okay');
    },1000); 
});

server.listen(3001,()=>{
    console.log("listening...")
})