public function getCurl($i = null)
{
if (null === $i) {
return parent::getCurl();
} elseif (isset($this->queue[$i])) {
list($request, $response, $curl) = $this->queue[$i];
return $curl;
} else {
throw new \InvalidArgumentException(sprintf('There is no cURL handler queued at position %s.', $i));
}
}
