<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteBase /admin/
 
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^ /admin/index.html [L]
  
  RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
  RewriteRule ^ https://%1%{REQUEST_URI} [L,R=301]

</IfModule> 
 

