Thank you for the profile.  I'm trying to move client vue part to another domain. In order to do that, i had to make a few modifications:   to Auth.php: public static function preflight() { return "OK"; } to Router.php: header('Access-Control-Allow-Origin: *'); header('Access-Control-Allow-Headers: Authorization, Content-Type'); . . $r->addGroup('/auth', function (\FastRoute\RouteCollector $r) { $r->addRoute('OPTIONS', '', Auth::class . '@preflight'); .