diff --git a/api/html/index.php b/api/html/index.php
index d9a872c..cbd9aca 100644
--- a/api/html/index.php
+++ b/api/html/index.php
@@ -7,10 +7,12 @@ $dotenv->load();
 use DI\Container;
 use Slim\Factory\AppFactory;
 use Slim\Routing\RouteCollectorProxy;
+use TorstenHettstedt\TimekeepingApi\Controller\PreflightController;
 use TorstenHettstedt\TimekeepingApi\Controller\WorkingHoursController;
 use TorstenHettstedt\TimekeepingApi\Controller\WorkingHoursViewController;
 use TorstenHettstedt\TimekeepingApi\Middleware\ErrorHandler;
 use TorstenHettstedt\TimekeepingApi\Middleware\JsonBodyParserMiddleware;
+use TorstenHettstedt\TimekeepingApi\Middleware\OriginAccessControlHandler;
 
 $container = new Container();
 
@@ -22,17 +24,25 @@ $container->set('databases', function () {
 AppFactory::setContainer($container);
 $app = AppFactory::create();
 $app->add(new JsonBodyParserMiddleware());
+$app->addBodyParsingMiddleware();
+$app->add(new OriginAccessControlHandler());
+$app->addRoutingMiddleware();
 
 $app->group('/views/working-hours', function (RouteCollectorProxy $group) {
+    $group->options('/weekly', PreflightController::class . ':preflight');
     $group->get('/weekly', WorkingHoursViewController::class . ':browseWeekly');
+    $group->options('/monthly', PreflightController::class . ':preflight');
     $group->get('/monthly', WorkingHoursViewController::class . ':browseMonthly');
+    $group->options('/yearly', PreflightController::class . ':preflight');
     $group->get('/yearly', WorkingHoursViewController::class . ':browseYearly');
 });
 
 $app->group('/working-hours', function (RouteCollectorProxy $group) {
+    $group->options('', PreflightController::class . ':preflight');
     $group->get('', WorkingHoursController::class . ':browse');
     $group->post('', WorkingHoursController::class . ':creat');
     $group->group('/{id:\d\d\d\d-\d\d-\d\d}', function (RouteCollectorProxy $group) {
+        $group->options('', PreflightController::class . ':preflight');
         $group->get('', WorkingHoursController::class . ':read');
         $group->put('', WorkingHoursController::class . ':update');
     });