server.js

const http = require('http');
const path = require('path');
const fs = require('fs');

const hostname = '0.0.0.0';
const port = 3000;

const server = http.createServer((request, response) => {
    var filePath = '.' + request.url;

    if (filePath == './') {
        filePath = './index.html';
    }

    var extname = String(path.extname(filePath)).toLowerCase();
    var mimeTypes = {
        '.html': 'text/html',
        '.js': 'text/javascript',
        '.css': 'text/css',
        '.json': 'application/json',
        '.png': 'image/png',
        '.jpg': 'image/jpg',
        '.gif': 'image/gif',
        '.wav': 'audio/wav',
        '.mp4': 'video/mp4',
        '.woff': 'application/font-woff',
        '.ttf': 'application/font-ttf',
        '.eot': 'application/vnd.ms-fontobject',
        '.otf': 'application/font-otf',
        '.svg': 'image/svg+xml'
    };
    var contentType = mimeTypes[extname] || 'application/octet-stream';

    fs.readFile(filePath, function(error, content) {
        if (error) {
            if(error.code == 'ENOENT') {
                console.log('request [404], NF ', request.url);

                response.writeHead(404);
                response.end(content, 'utf-8');

                /*fs.readFile('./404.html', function(error, content) {
                    response.writeHead(404, { 'Content-Type': contentType });
                    response.end(content, 'utf-8');
                });*/
            }
            else {
                console.log('request [500], Internal Server Error ', request.url);
                response.writeHead(500);
                response.end('Sorry, check with the site admin for error: '+error.code+' ..\n');
                response.end();
            }
        }
        else {
            if(request.url == "/") {
                console.log('request [200], OK ', "/index.html");
            } else {
                console.log('request [200], OK ', request.url);
            }
            response.writeHead(200, { 'Content-Type': contentType });
            response.end(content, 'utf-8');
        }
    });
});

server.listen(port, hostname, () => {
    console.log(`Server running at http://${hostname}:${port}/`);
});