Allow trailing slash for Symfony2 route without params?

I like @Kuchengeschmack’s answer (https://stackoverflow.com/a/11078348/593957) because it doesn’t trigger external redirects.

Here’s a yaml version:

acme_admin_dashboard:
    pattern:  /{_locale}/admin{trailingSlash}
    defaults: { _controller: AcmeBundle:Admin:dashboard, trailingSlash : "https://stackoverflow.com/" }
    requirements: { trailingSlash : "[/]{0,1}" }