Exclude Redirect rule on an Alias domain - for specific file (Robots.txt)

Question

I have my main site: example.com that contains all files on its root folder.

I have a new domain example.net, that I want users to use as an alias domain, so users will actually see the exact content of example.com and its files, yet see in their address bar the site example.net.

But, I don't want Google to index example.net site at all, as this would be duplicate content.

Therefore, I want to exclude it using robots.txt, but if I use an alias domain, it will try to read robots.txt of example.com.

What can be the solution? any way to exclude the file?

Answer 1

You can use:

RewriteEngine on
RewriteCond %{HTTP_HOST} example\.net$ [NC]
RewriteRule ^robots\.txt$ robots-net.txt [NC,L] 

Add your robot rules in the file robots-net.txt to be read with robots.txt but only when accessed from example.net.