Keepalive about http HOT 6 OPEN

$conn= new HttpConnection(...);
$conn->useKeepAlive();  // Use default strategy
$conn->useKeepAlive(newinstance(KeepAlive::class, [], [
  'timeout' => function($request, $response) {
    if ('example.com' === $request->url->getHost()) {
      return 0.0;   // Close immediately
    } else {
      return 30.0;  // Keep open for 30.0 seconds
    }
  }
]));

$conn= new HttpConnection(...);
$conn->usingKeepAlive(function() {
  $r1= $conn->get(...);
  $r1->abort();  // Do not process content until end

  $r2= $conn->post(...);
  Streams::readAll($r2->in());
});

$conn= new HttpConnection(...);
$req= $conn->create(new HttpRequest())->keepAlive();
$req= $conn->create(new HttpRequest())->keepAlive(newinstance(KeepAlive::class, [], [
  // See idea #1 above
])));
$res= $conn->send($req);

$conn= new HttpConnection(...);
$conn->get(..., function($res) {
  $res->abort();

  // or: Streams::readAll($res->in());
});

$conn= new HttpConnection(...);
$pool= $conn->pool(5);
$pool->get()->then(function($res) {
  // Uses first socket
});
$pool->post()->then(function($res) {
  // Uses first *free* socket within the pool
});