From mediawiki.org
This page is a translated version of the page Manual:$wgMainPageIsDomainRoot and the translation is 43% complete.
Server-URLs und Dateipfade: $wgMainPageIsDomainRoot
Controls if the main page should be served as the domain root.
Eingeführt in Version:1.34.0 (Gerrit change 520139; git #a5deeac5)
Entfernt in Version:weiterhin vorhanden
Erlaubte Werte:(Wahrheitswert)

If true, users visiting your wiki's main page from the domain root will not be redirected. This setting requires that short URLs be configured in order to be functional.

Setting this may incur in some overhead. Siehe task T302186.