Im Folgenden alles im Rewrite-Modul mit RewriteEngine On, vgl. auskommentierte Zeilen unten.

#<IfModule mod_rewrite.c>
#  RewriteEngine On
  RewriteCond %{SERVER_PORT} !^443$
  RewriteRule (.*) https://%{HTTP_HOST}/$1 [R=301,L]
 
  #ODER:
  RewriteCond %{HTTPS} !=on
  RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
#</IfModule>

RewriteCond %{HTTP_HOST} !^www. [NC]
RewriteCond %{HTTP_HOST} !^.*\..*\..* [NC]
RewriteRule (.*) http://www.%{HTTP_HOST}/$1 [R=301,L]

RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$1 [R=301,L]

Redirect 301 /defaultsite https://name-der-domain.de/