node/test/parallel/test-http-keep-alive-empty-line.mjs

import * as common from '../common/index.mjs';
import assert from 'node:assert';
import { createServer } from 'node:http';
import { connect } from 'node:net';

const server = createServer({
  connectionsCheckingInterval: 100,
  headersTimeout: 100,
  keepAliveTimeout: 300
}, (req, res) => {
  res.writeHead(404);
  res.end();

  req.socket.on('close', common.mustCall(() => {
    server.close();
  }));
});

server.listen(0, () => {
  const client = connect({
    host: 'localhost',
    port: server.address().port,
  }, () => {
    client.write(
      'GET / HTTP/1.1\r\n' +
          'Host: localhost:3000\r\n' +
          'Content-Length: 0\r\n' +
          '\r\n'
    );

    setTimeout(() => {
      client.write('\r\n');
    }, 100);

    let responseBuffer = '';

    client.on('data', (chunk) => {
      responseBuffer += chunk.toString();

      // Check if we've received the full header (ending with \r\n\r\n)
      if (responseBuffer.includes('\r\n\r\n')) {
        const statusLine = responseBuffer.split('\r\n')[0];
        const status = statusLine.split(' ')[1];
        assert.strictEqual(status, '404');
        client.end();
      }
    });
    client.on('end', common.mustCall());
  });
});