Different robots.txt for two different domains point to same folder

Question

I have the following two domains:

example.com

test.example.com

Both point to same folder which is public_html. What I want is a different robots.txt file for each domain. So when someone browse example.com/robots.txt then a different file is shown. And when someone go to test.example.com/robots.txt then a different file is shown.

How can I do this using URL rewriting in .htaccess?

Answer 1

Remeber that no one from Internet can see your directory tree, so stackoverflow.com/ and test.stackoverflow.com are completely diffrent sites for us and search robots.

You can do that by checking the HTTP host in query:

RewriteCond %{HTTP_HOST} ^test
RewriteRule robots.txt someotherrobots.txt