Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

const http = require('http');

const server = http.createServer((req, res) => {
    // Read request headers:
    const contentType = req.headers['content-type'];
    const authHeader  = req.headers['authorization'];

console.log('Content-Type:', contentType);
    console.log('Authorization:', authHeader);

// Set individual response headers:
    res.setHeader('X-Powered-By', 'Node.js');
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Cache-Control', 'no-store');

// writeHead sets status + headers at once:
    res.writeHead(200, {
        'Content-Type': 'application/json',
        'X-Request-ID': '12345',
    });

// Status code reference:
    // 200 OK            — success
    // 201 Created       — resource created
    // 204 No Content    — success, no body
    // 301 Moved Permanently — redirect
    // 400 Bad Request   — client error
    // 401 Unauthorized  — not authenticated
    // 403 Forbidden     — not authorized
    // 404 Not Found     — resource missing
    // 500 Internal Server Error — server crash

res.end(JSON.stringify({ status: 'ok' }));
});

server.listen(3000);