core-bundle/src/Routing/FrontendLoader.php
private function addIndexRoute(RouteCollection $routes, array $defaults): void
    {
        $route = new Route('/', $defaults);

        $this->addLocaleToRoute($route);

        $routes->add('contao_index', $route);
    }
private function addIndexRoute(RouteCollection $routes, array $defaults): void
    {
        $route = new Route('/', $defaults);

        $this->addLocaleToRoute($route);

        $routes->add('contao_index', $route);
    }
Adds a route to redirect a user to the index page.