Resolve the system path.
Symfony\Component\HttpKernel\Event\GetResponseEvent $event: The Event to process.
public function onKernelRequestPathResolve(GetResponseEvent $event) {
$request = $event
->getRequest();
$path = $this
->extractPath($request);
$path = $this->aliasManager
->getSystemPath($path);
$this
->setPath($request, $path);
$this->aliasManager
->setCacheKey($path);
}