This page is shown because you do not have a cookie set with the name AUTHORIZED.
It'll load a script from broyer.info whose content depends on whether you're authenticated there. If that's the case, the page should set the ltgt.net cookie and refresh to show you the protected resource. Otherwise, you'll be directed to broyer.info to sign in.
The cookie is set here from javascript. You'd generally want to use other means, such as redirecting to an URL that will set the cookie and redirect back to the protected resource.