طلبات HTTP واستجاباتها

import { createServer } from 'node:http';
import { once } from 'node:events';
const server = createServer((req, res) => {
  const url = new URL(req.url, 'http://local');
  if (req.method === 'GET' && url.pathname === '/health') {
    res.writeHead(200, { 'content-type': 'application/json' });
    return res.end(JSON.stringify({ ok: true }));
  }
  res.writeHead(404); res.end('Not found');
});
server.listen(0, '127.0.0.1'); await once(server, 'listening');
try {
  const response = await fetch(`http://127.0.0.1:${server.address().port}/health`);
  console.log(response.status, (await response.json()).ok);
} finally { await new Promise((resolve, reject) => server.close(e => e ? reject(e) : resolve())); }

200 true

يحلل العميل JSON بعد تلقي الاستجابة. وتغلق finally الاستماع حتى إذا فشل تحقق العميل.

import { createServer } from 'node:http';
import { once } from 'node:events';
const body = 'hello';
const server = createServer((req, res) => {
  res.writeHead(200, { 'content-type': 'text/plain', 'content-length': Buffer.byteLength(body) });
  res.end(req.method === 'HEAD' ? undefined : body);
});
server.listen(0, '127.0.0.1'); await once(server, 'listening');
try {
  const response = await fetch(`http://127.0.0.1:${server.address().port}`, { method: 'HEAD' });
  console.log(response.status, response.headers.get('content-length'), (await response.text()).length);
} finally { await new Promise((resolve, reject) => server.close(e => e ? reject(e) : resolve())); }

200 5 0

تعلن HEAD تمثيلا من خمسة بايتات لكنها لا ترسل جسما، فيكون طول النص المستلم صفرا.