My URLs are: https://www.pocketnavigation.de for my first multisite blog (only 1 blog is active currently) and https://www.pocketnavigation.de for the backend. If I dump the $_SERVER var, then I see, that $_SERVER[‘SERVER_NAME’] has the value “pocketnavigation.de” in both cases. In contrast to this the var $_SERVER[‘HTTP_HOST’] has the value “www.pocketnavigation.de” in both cases.