http: always emit close on req and res

PR-URL: #20611
Fixes: #20600
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

lib/_http_server.js

@@ -561,6 +561,8 @@ function resOnFinish(req, res, socket, state, server) {
    req._dump();

  res.detachSocket(socket);
  req.emit('close');
  res.emit('close');

  if (res._last) {
    if (typeof socket.destroySoon === 'function') {

test/parallel/test-http-req-res-close.js

@@ -0,0 +1,16 @@
'use strict';

const common = require('../common');
const http = require('http');

const server = http.Server(common.mustCall((req, res) => {
  res.end();
  res.on('finish', common.mustCall());
  res.on('close', common.mustCall());
  req.on('close', common.mustCall());
  res.socket.on('close', () => server.close());
}));

server.listen(0, common.mustCall(() => {
  http.get({ port: server.address().port }, common.mustCall());
}));