--- a/web/src/Controller/Authentication.php
+++ b/web/src/Controller/Authentication.php
@@ -83,7 +83,7 @@
      * @param Application $app
      * @return bool false if authentication failed, true otherwise
      */
-    protected function processLogin($user, $password, Application $app)
+    public function processLogin($user, $password, Application $app)
     {
         $app['http.client']->setAuthentication($user, $password, $app['caldav.authmethod']);
 
--- a/web/app/controllers.php
+++ b/web/app/controllers.php
@@ -7,6 +7,7 @@
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Silex\Application;
 
+use AgenDAV\Controller\Authentication;
 use AgenDAV\DateHelper;
 
 // Authentication
@@ -68,6 +69,13 @@
         return;
     }
 
+    if ($request->headers->get('authorization') != null) {
+        $authController = new Authentication();
+        if ($authController->processLogin($request->headers->get('PHP_AUTH_USER'), $request->headers->get('PHP_AUTH_PW'), $app)) {
+            return;
+        }
+    }
+
     if ($request->isXmlHttpRequest()) {
         return new JsonResponse([], 401);
     } else {