Default HttpCache debug option to that of

src/Silex/Provider/HttpCacheServiceProvider.php

@@ -28,6 +28,12 @@ class HttpCacheServiceProvider implements ServiceProviderInterface
     public function register(Application $app)
     {
         $app['http_cache'] = $app->share(function ($app) {
+            $app['http_cache.options'] = array_replace(
+                array(
+                    'debug' => $app['debug'],
+                ), $app['http_cache.options']
+            );
+
             return new HttpCache($app, $app['http_cache.store'], $app['http_cache.esi'], $app['http_cache.options']);
         });
 

tests/Silex/Tests/Provider/HttpCacheServiceProviderTest.php

@@ -57,6 +57,19 @@ class HttpCacheServiceProviderTest extends \PHPUnit_Framework_TestCase
 
         $this->assertTrue($finished);
     }
+
+    public function testDebugDefaultsToThatOfApp()
+    {
+        $app = new Application();
+
+        $app->register(new HttpCacheServiceProvider(), array(
+            'http_cache.cache_dir' => sys_get_temp_dir().'/silex_http_cache_'.uniqid(),
+        ));
+
+        $app['debug'] = true;
+        $app['http_cache'];
+        $this->assertTrue($app['http_cache.options']['debug']);
+    }
 }
 
 class UnsendableResponse extends Response