File nodejs web server

app.js

/* === Nodejs web server === 
	* 
	* dgn module `http`
	* http.createServer(callback(require, respon))
	* .listen(port, hostname, callback())
	*
	* */

const http = require('http')
const fs   = require('fs')
const port = 3000

/* --- Buat server dengan createServer() ---  */
const server = http.createServer( (req, res) => {
	/* -- ubah type content menjadi html -- */
	res.writeHead(200, {
		'Content-Type': 'text/html' // => default plain text
	})
	
	/* -- buat routing dari request url --  */
	const url = req.url
	if (url === '/contact') {
		res.write('Ini halaman contact')
	} else if (url === '/about') {
		res.write('Ini halaman about')
	} else {
		fs.readFile('./index.html', 'utf8', (err, data) => {
			if (err) {
				res.writeHead(404)
				res.write(`Error : ${err}`)
			} else {
				res.write(data)
				console.log(data)
			}
		})
	}	

	/* -- akhiri respond -- */
	res.end()
} )

/* -- Jalankan server dgn listen() --  */
server.listen(port, () => {
	console.log(`Server is listening on port ${port} ... `)
})