2 domains, one mirror, how best to connect?

Question

Web development

Tell me , there are 2 sites:
domen.com (main, files on it)
domen-2.com
Through .htaccess, you can make
the domain in the browser not change when opening domen-2.com, but domen.com shows the files?
I mean, no 301 redirect so you don't redirect to another domain.

Answer 1

If you want the same content to be shown on two domains, then conditionally the DocumentRoot for both domains should be the same.
domain-2.com should be ServerAlias ​​for domain.com and no redirects should be written in htaccess.