diff --git a/lib/Alchemy/Phrasea/Application/Api.php b/lib/Alchemy/Phrasea/Application/Api.php
index cdd0f3c747..86ecc21fa3 100644
--- a/lib/Alchemy/Phrasea/Application/Api.php
+++ b/lib/Alchemy/Phrasea/Application/Api.php
@@ -52,6 +52,12 @@ return call_user_func(function ($environment = PhraseaApplication::ENV_PROD) {
         return $monolog;
     }));
 
+    $app['phraseanet.content-negotiation.priorities'] = array_merge(
+        ['application/json', 'application/yaml', 'text/yaml', 'text/javascript', 'application/javascript'],
+        V1::$extendedContentTypes['json'],
+        V1::$extendedContentTypes['yaml']
+    );
+
     // handle API content negotiation
     $app->before(function(Request $request) use ($app) {
         // register custom API format
@@ -60,24 +66,9 @@ return call_user_func(function ($environment = PhraseaApplication::ENV_PROD) {
         $request->setFormat(Result::FORMAT_JSONP_EXTENDED, V1::$extendedContentTypes['jsonp']);
         $request->setFormat(Result::FORMAT_JSONP, array('text/javascript', 'application/javascript'));
 
-        $format = $app['negotiator']->getBest(
-            $request->headers->get('accept', 'application/json'),
-            array_merge(
-                ['application/json', 'application/yaml', 'text/yaml', 'text/javascript', 'application/javascript'],
-                V1::$extendedContentTypes['json'],
-                V1::$extendedContentTypes['yaml']
-            )
-        );
-
-        // throw unacceptable http error if API can not handle asked format
-        if (null === $format) {
-            $app->abort(406);
-        }
         // set request format according to negotiated content or override format with JSONP if callback parameter is defined
         if (trim($request->get('callback')) !== '') {
             $request->setRequestFormat(Result::FORMAT_JSONP);
-        } else {
-            $request->setRequestFormat($request->getFormat($format->getValue()));
         }
 
         // tells whether asked format is extended or not
diff --git a/lib/Alchemy/Phrasea/Core/Event/Subscriber/ContentNegotiationSubscriber.php b/lib/Alchemy/Phrasea/Core/Event/Subscriber/ContentNegotiationSubscriber.php
index d79d02d2d7..8350e37c03 100644
--- a/lib/Alchemy/Phrasea/Core/Event/Subscriber/ContentNegotiationSubscriber.php
+++ b/lib/Alchemy/Phrasea/Core/Event/Subscriber/ContentNegotiationSubscriber.php
@@ -11,18 +11,25 @@
 
 namespace Alchemy\Phrasea\Core\Event\Subscriber;
 
-use Alchemy\Phrasea\Application;
+use Negotiation\Accept;
+use Negotiation\Negotiator;
+use Silex\Application;
+use Symfony\Component\HttpKernel\Exception\HttpException;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 
 class ContentNegotiationSubscriber implements EventSubscriberInterface
 {
-    private $app;
+    /** @var Negotiator */
+    private $negotiator;
+    /** @var array */
+    private $priorities;
 
-    public function __construct(Application $app)
+    public function __construct(Negotiator $negotiator, array $priorities)
     {
-        $this->app = $app;
+        $this->negotiator = $negotiator;
+        $this->priorities = $priorities;
     }
 
     public static function getSubscribedEvents()
@@ -34,11 +41,10 @@ class ContentNegotiationSubscriber implements EventSubscriberInterface
 
     public function onKernelRequest(GetResponseEvent $event)
     {
-        $priorities = array('text/html', 'application/vnd.phraseanet.record-extended+json', 'application/json');
-        $format = $this->app['negotiator']->getBest($event->getRequest()->headers->get('accept', '*/*'), $priorities);
+        $format = $this->negotiator->getBest($event->getRequest()->headers->get('accept', '*/*'), $this->priorities);
 
-        if (null === $format) {
-            $this->app->abort(406, 'Not acceptable');
+        if (!$format instanceof Accept) {
+            throw new HttpException(406);
         }
 
         $event->getRequest()->setRequestFormat($event->getRequest()->getFormat($format->getValue()));
diff --git a/lib/Alchemy/Phrasea/Core/Provider/PhraseaEventServiceProvider.php b/lib/Alchemy/Phrasea/Core/Provider/PhraseaEventServiceProvider.php
index ba556228e9..7b1f5c4f84 100644
--- a/lib/Alchemy/Phrasea/Core/Provider/PhraseaEventServiceProvider.php
+++ b/lib/Alchemy/Phrasea/Core/Provider/PhraseaEventServiceProvider.php
@@ -40,8 +40,15 @@ class PhraseaEventServiceProvider implements ServiceProviderInterface
         $app['phraseanet.session-manager-subscriber'] = $app->share(function (Application $app) {
             return new SessionManagerSubscriber($app);
         });
+        $app['phraseanet.content-negotiation.priorities'] = [
+            'text/html',
+            'application/json',
+        ];
         $app['phraseanet.content-negotiation-subscriber'] = $app->share(function (Application $app) {
-            return new ContentNegotiationSubscriber($app);
+            return new ContentNegotiationSubscriber(
+                $app['negotiator'],
+                $app['phraseanet.content-negotiation.priorities']
+            );
         });
         $app['phraseanet.record-edit-subscriber'] = $app->share(function (Application $app) {
             return new RecordEditSubscriber();
diff --git a/tests/Alchemy/Tests/Phrasea/Core/Event/Subscriber/ContentNegotiationSubscriberTest.php b/tests/Alchemy/Tests/Phrasea/Core/Event/Subscriber/ContentNegotiationSubscriberTest.php
index fa8f99fbc2..b703046dee 100644
--- a/tests/Alchemy/Tests/Phrasea/Core/Event/Subscriber/ContentNegotiationSubscriberTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Core/Event/Subscriber/ContentNegotiationSubscriberTest.php
@@ -31,7 +31,7 @@ class ContentNegotiationSubscriberTest extends \PHPUnit_Framework_TestCase
     private function request($accept)
     {
         $app = new Application(Application::ENV_TEST);
-        $app['dispatcher']->addSubscriber(new ContentNegotiationSubscriber($app));
+        $app['dispatcher']->addSubscriber(new ContentNegotiationSubscriber($app['negotiator'], $app['phraseanet.content-negotiation.priorities']));
         $app->get('/content/negociation', function () {
             return '';
         });