[HttpKernel] fixed internal subrequests having an if-modified-since-header

Author: MalteWunsch

src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php

@@ -129,6 +129,8 @@ protected function createSubRequest($uri, Request $request)
         }
 
         $server['REMOTE_ADDR'] = '127.0.0.1';
+        unset($server['HTTP_IF_MODIFIED_SINCE']);
+        unset($server['HTTP_IF_NONE_MATCH']);
 
         $subRequest = Request::create($uri, 'get', array(), $cookies, array(), $server);
         if ($request->headers->has('Surrogate-Capability')) {

src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php

@@ -197,6 +197,19 @@ public function testESIHeaderIsKeptInSubrequestWithTrustedHeaderDisabled()
 
         Request::setTrustedHeaderName(Request::HEADER_CLIENT_IP, $trustedHeaderName);
     }
+
+    public function testHeadersPossiblyResultingIn304AreNotAssignedToSubrequest()
+    {
+        $expectedSubRequest = Request::create('/');
+        if (Request::getTrustedHeaderName(Request::HEADER_CLIENT_IP)) {
+            $expectedSubRequest->headers->set('x-forwarded-for', array('127.0.0.1'));
+            $expectedSubRequest->server->set('HTTP_X_FORWARDED_FOR', '127.0.0.1');
+        }
+
+        $strategy = new InlineFragmentRenderer($this->getKernelExpectingRequest($expectedSubRequest));
+        $request = Request::create('/', 'GET', array(), array(), array(), array('HTTP_IF_MODIFIED_SINCE' => 'Fri, 01 Jan 2016 00:00:00 GMT', 'HTTP_IF_NONE_MATCH' => '*'));
+        $strategy->render('/', $request);
+    }
 }
 
 class Bar