fix for OPTIONS method

Controllers/ExportController.php

@@ -40,6 +40,12 @@ class ExportController extends ControllerBase
 
     public function exportXlsAction()
     {
+        $response = new Response();
+
+        if ($this->request->isOptions()) {
+            $response->setStatusCode(200);
+            return $response;
+        }
         $this->transformToCsv();
         return $this->exportXls();
     }