/**
* @param float $start
* @param float $end
* @param \Psr\Http\Message\RequestInterface $request
* @param \Psr\Http\Message\ResponseInterface $response
*/
public function add($start, $end, RequestInterface $request, ResponseInterface $response = null)
{
$description = $this->describe($request, $response);
$name = spl_object_hash($request);
$this->timeline->addEvent($name, $description, $start, $end);
}
