server.js

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

const server = http.createServer((req, res) => {
    let filePath = '.' + req.url;
    if (filePath === './') {
        filePath = './tetris.html';
    }

    const extname = String(path.extname(filePath)).toLowerCase();
    const mimeTypes = {
        '.html': 'text/html',
        '.js': 'text/javascript',
        '.css': 'text/css'
    };

    const contentType = mimeTypes[extname] || 'application/octet-stream';

    fs.readFile(filePath, (error, content) => {
        if (error) {
            if(error.code == 'ENOENT') {
                res.writeHead(404);
                res.end('Archivo no encontrado');
            }
            else {
                res.writeHead(500);
                res.end('Error del servidor: '+error.code);
            }
        }
        else {
            res.writeHead(200, { 'Content-Type': contentType });
            res.end(content, 'utf-8');
        }
    });
});

const PORT = 3000;
server.listen(PORT, () => {
    console.log(`Servidor ejecutándose en el puerto ${PORT}`);
});