$app->options('/{routes:.+}', function ($request, $response, $args) {
   return $response;
});

$app->add(function ($req, $res, $next) {
$response = $next($req, $res);
return $response
        ->withHeader('Access-Control-Allow-Origin', '*')
        ->withHeader('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type, Accept, Origin, Authorization')
        ->withHeader('Access-Control-Allow-Methods', 'GET, POST, DELETE, PUT, OPTIONS');
});