ALPHA 3.0.2a

vendor/symfony/http-foundation/StreamedResponse.php

@@ -111,7 +111,7 @@ class StreamedResponse extends Response
             throw new \LogicException('The Response callback must not be null.');
         }
 
-        call_user_func($this->callback);
+        \call_user_func($this->callback);
 
         return $this;
     }
@@ -141,4 +141,16 @@ class StreamedResponse extends Response
     {
         return false;
     }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return $this
+     */
+    public function setNotModified()
+    {
+        $this->setCallback(function () {});
+
+        return parent::setNotModified();
+    }
 }