added a way to disable the profiler

src/Symfony/Component/HttpKernel/Profiler/Profiler.php

@@ -27,12 +27,14 @@ class Profiler implements \ArrayAccess
     protected $collectors;
     protected $response;
     protected $logger;
+    protected $enabled;
 
     public function __construct(ProfilerStorage $profilerStorage, LoggerInterface $logger = null)
     {
         $this->profilerStorage = $profilerStorage;
         $this->logger = $logger;
         $this->collectors = array();
+        $this->enabled = true;
     }
 
     /**
@@ -75,6 +77,11 @@ class Profiler implements \ArrayAccess
         return $profiler;
     }
 
+    public function disable()
+    {
+        $this->enabled = false;
+    }
+
     /**
      * Collects data for the given Response.
      *
@@ -82,6 +89,10 @@ class Profiler implements \ArrayAccess
      */
     public function collect(Response $response)
     {
+        if (false === $this->enabled) {
+            return;
+        }
+
         $this->response = $response;
         $this->response->headers->set('X-Debug-Token', $this->profilerStorage->getToken());
 

src/Symfony/Component/HttpKernel/Profiler/WebDebugToolbarListener.php

@@ -48,8 +48,8 @@ class WebDebugToolbarListener
         }
 
         $request = $event->getParameter('request');
-
-        if ('3' === substr($response->getStatusCode(), 0, 1)
+        if (!$response->headers->has('X-Debug-Token')
+            || '3' === substr($response->getStatusCode(), 0, 1)
             || ($response->headers->has('Content-Type') && false === strpos($response->headers->get('Content-Type'), 'html'))
             || 'html' !== $request->getRequestFormat()
             || $request->isXmlHttpRequest()