Verwendung von SSL/https erzwingen
Füge diese Regeln ganz oben in der .htaccess Datei ein.
#BEGIN Force https
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301,NE]
Header always set Content-Security-Policy "upgrade-insecure-requests;"
</IfModule>
#END Force https