title: What does "expose"=true mean in symfony?
body: <p>What does the options={"expose"=true} mean in @Route() in a symfony controller?</p>
  
  <pre><code>    /**
       * @Route("/{id}", name="notification_show", options={"expose"=true}, requirements={"id": "\d+"})
       */
      public function showAction(Request $request, Notification $notification)
      {
          // ...
      }
  </code></pre>