server.js

const http = require('http');
const fs = require('fs');
const _ = require('lodash');

const server = http.createServer((req, res) => { 
    //lodash
    const num = _.random(0,20);
    console.log(num);
    const greet = _.once(() => { // for executing only one time
        console.log('hello');
    })
    greet();
    greet(); //this second call will not be executed
console.log(req.url, req.method);
//set header content type
//res.setHeader('Content-Type', 'text/plain');
res.setHeader('Content-Type', 'text/html');
// res.write('<p>hello,bro</p>');

let path='./views'; 
switch(req.url){
    case '/':
        path +='/index.html';
        res.statusCode=200;
        break;
    case '/about':
        path +='/about.html';
        res.statusCode=200;
        break;
    case '/about-me':
        res.statusCode=301;
        res.setHeader('Location', '/about');
        break;
    default:
        path += '/404.html';
        res.statusCode=404;
        break;

}
//send  HTML FILE
fs.readFile(path, (err,data) => {
    if(err){
        console.log(err);
         res.end();
        
    }else{
        
        res.end(data);
    }
})

});

server.listen(3000, 'localhost', () => {
    console.log('listening for request in 3000')
})