HTTP server with delay option

http_server.js

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

// Parse command-line arguments
const args = process.argv.slice(2);
const baseDirectory = args[0] || '.'; // Default to current directory
const portArg = args.find(arg => arg.startsWith('--port='));
const delayArg = args.find(arg => arg.startsWith('--delay='));

// Extract port and delay values
const port = portArg ? parseInt(portArg.split('=')[1], 10) : 9000;
const delay = delayArg ? parseInt(delayArg.split('=')[1], 10) : 0;

// Ensure directory exists
if (!fs.existsSync(baseDirectory) || !fs.statSync(baseDirectory).isDirectory()) {
    console.error(`Error: Directory "${baseDirectory}" not found.`);
    process.exit(1);
}

// Create HTTP server
const server = http.createServer((req, res) => {
    const parsedUrl = url.parse(req.url);
    let filePath = path.join(baseDirectory, decodeURIComponent(parsedUrl.pathname));

    // Default to index.html if requesting root
    if (parsedUrl.pathname === '/') {
        filePath = path.join(baseDirectory, 'index.html');
    }

    // Check if file exists
    fs.stat(filePath, (err, stats) => {
        if (err || !stats.isFile()) {
            res.writeHead(404, { 'Content-Type': 'text/plain' });
            res.end('404 Not Found');
            return;
        }

        // Delay response if specified
        setTimeout(() => {
            // Determine content type
            const ext = path.extname(filePath).toLowerCase();
            const contentType = {
                '.html': 'text/html',
                '.json': 'application/json',
                '.js': 'application/javascript',
                '.css': 'text/css',
                '.png': 'image/png',
                '.jpg': 'image/jpeg',
                '.gif': 'image/gif',
                '.svg': 'image/svg+xml',
                '.txt': 'text/plain',
            }[ext] || 'application/octet-stream';

            // Serve file
            res.writeHead(200, { 'Content-Type': contentType });
            fs.createReadStream(filePath).pipe(res);
        }, delay);
    });
});

// Start server
server.listen(port, () => {
    console.log(`Serving "${baseDirectory}" on port ${port} with ${delay}ms delay`);
});