How to strip HTML from a URL without specifying a domain?

Question

HTML

There is this code in htaccess.

RewriteEngine On
RewriteBase /
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^.]+)\.html\ HTTP
RewriteRule ^([^\.]+)\.p?html?$ http://<ДОМЕН.РУ>/$1 [R=301,L]
RewriteCond %{REQUEST_URI} !(\.[^./]+)$
RewriteCond %{REQUEST_fileNAME} !-d
RewriteCond %{REQUEST_fileNAME} !-f
RewriteRule (.*) /$1.html [L]

I have 3 domains, I do not want to prescribe the same code for each.
How to make one code work for all 3 domains?

Answer 1

%{HTTP_HOST}