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    <p>I found something that works. The <a href="http://symfony.com/doc/current/book/internals.html#kernel-exception-event">Symfony2 internals doc on the kernel.exeption event</a> mention that a response can be set on the event, and the <a href="http://api.symfony.com/2.0/Symfony/Component/HttpKernel/Event/GetResponseForExceptionEvent.html">GetResponseForExceptionEvent docs</a> say</p> <blockquote> <p>The propagation of this event is stopped as soon as a response is set.</p> </blockquote> <p>I cobbled together a listener that appears to do just what I want:</p> <pre class="lang-php prettyprint-override"><code>&lt;?php namespace Acme\DemoBundle\Listener; use Symfony\Component\EventDispatcher\EventDispatcher; use Symfony\Component\HttpKernel\Log\LoggerInterface; use Symfony\Component\EventDispatcher\Event; use Symfony\Component\HttpKernel\KernelEvents; use Symfony\Component\HttpFoundation\Response; use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent; class ExceptionLoggingListener { private $logger; public function __construct(LoggerInterface $logger) { $this-&gt;logger = $logger; } public function onKernelException(GetResponseForExceptionEvent $event) { if(!$event) { $this-&gt;logger-&gt;err("Unknown kernel.exception in ".__CLASS__); return; } $notFoundException = '\Symfony\Component\HttpKernel\Exception\NotFoundHttpException'; $e = $event-&gt;getException(); $type = get_class($e); if ($e instanceof $notFoundException) { $this-&gt;logger-&gt;info($e-&gt;getMessage()); $response = new Response(Response::$statusTexts[404], 404); $event-&gt;setResponse($response); return; } $accessDeniedException = '\Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException'; if ($e instanceof $accessDeniedException) { $this-&gt;logger-&gt;info($e-&gt;getMessage()); $response = new Response(Response::$statusTexts[403], 403); $event-&gt;setResponse($response); return; } $this-&gt;logger-&gt;err("kernel.exception of type $type. Message: '".$e-&gt;getMessage()."'\nFile: ".$e-&gt;getFile().", line ".$e-&gt;getLine()."\nTrace: ".$e-&gt;getTraceAsString()); } } </code></pre>
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    1. POHow do I reduce the severity of NotFoundHttpException?
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    1. USAdam Monsen
    1. USAdam Monsen
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    1. POHow do I reduce the severity of NotFoundHttpException?
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    1. COrandom side-note: you should use `instaceof` instead of `$type === 'blah'` http://php.net/manual/en/internals2.opcodes.instanceof.php
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    2. COGood call. Fixed, thanks!
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      1. USAdam Monsen
    3. CO[Lachlan Pease wrote](http://article.gmane.org/gmane.comp.php.symfony.symfony2/9774/): "The alternative would be to subclass Symfony\Component\HttpKernel\EventListener\ExceptionListener and change the logic to only warn() on NotFoundHttpExceptions - this would have the benefit of not needing multiple exception listeners (hardly a big thing), but you'd have to keep all of the response generating code in your own subclass, which is a maintenance nightmare." (Thanks, Lachlan, that sounds even better!)
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