The main part of handle function in HttpKernel.php in Symfony 5

HttpKernel.php

<?php
public function handle(Request $request, int $type = HttpKernelInterface::MASTER_REQUEST, bool $catch = true)
{
    try {
        return $this->handleRaw($request, $type);
    } catch (\Exception $e) {
        return $this->handleThrowable($e, $request, $type);
    }
}

private function handleRaw(Request $request, int $type = self::MASTER_REQUEST): Response
{
    // request
    $this->requestStack->push($request);
    $event = new RequestEvent($this, $request, $type);
    $this->dispatcher->dispatch($event, KernelEvents::REQUEST);

    // controller
    $controller = $this->resolver->getController($request);
    $event = new ControllerEvent($this, $controller, $request, $type);
    $this->dispatcher->dispatch($event, KernelEvents::CONTROLLER);

    // controller arguments
    $arguments = $this->argumentResolver->getArguments($request, $controller);
    $event = new ControllerArgumentsEvent($this, $controller, $arguments, $request, $type);
    $this->dispatcher->dispatch($event, KernelEvents::CONTROLLER_ARGUMENTS);

    // call controller
    $response = $controller(...$arguments);

    // view
    if (!$response instanceof Response) {
        $event = new ViewEvent($this, $request, $type, $response);
        $this->dispatcher->dispatch($event, KernelEvents::VIEW);
        $response = $event->getResponse();
    }

    return $this->filterResponse($response, $request, $type);
}

private function filterResponse(Response $response, Request $request, int $type): Response
{
    $event = new ResponseEvent($this, $request, $type, $response);
    $this->dispatcher->dispatch($event, KernelEvents::RESPONSE);
    $this->finishRequest($request, $type);
    return $event->getResponse();
}

private function finishRequest(Request $request, int $type)
{
    $this->dispatcher->dispatch(new FinishRequestEvent($this, $request, $type), KernelEvents::FINISH_REQUEST);
    $this->requestStack->pop();
}

private function handleThrowable(\Throwable $e, Request $request, int $type): Response
{
    $event = new ExceptionEvent($this, $request, $type, $e);
    $this->dispatcher->dispatch($event, KernelEvents::EXCEPTION);
    $response = $event->getResponse();
    return $this->filterResponse($response, $request, $type);
}