Q1. How do you create a basic HTTP server in Node.js?
Use the http module:
const http = require('http'); const server = http.createServer((req, res) => { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World'); }); server.listen(3000, () => console.log('Server running'));Q2. What does http.createServer return?
It returns an instance of http.Server, which is an EventEmitter. You can listen for events like 'request', 'connection', etc. The server object has methods like .listen() to start listening, .close() to stop, and properties like .maxHeadersCount. The callback passed to createServer is automatically attached to the 'request' event.
Q3. How do you handle different URLs in a raw HTTP server?
In the request handler, check req.url. Example:
if (req.url === '/') { res.end('Home'); } else if (req.url === '/about') { res.end('About'); } else { res.statusCode = 404; res.end('Not Found'); }Q4. How do you set the HTTP status code and headers?
Use res.statusCode = 404 to set status. For headers, use res.setHeader('Content-Type', 'text/html') or res.writeHead(200, {'Content-Type': 'text/html'}) which sets both status and headers. Headers must be set before writing the body. Multiple headers can be set.
Q5. How do you get the server to listen on a specific port?
server.listen(port, [hostname], [backlog], [callback]). Example:
server.listen(3000, '127.0.0.1', () => { console.log('Server bound'); });