Serve different robots.txt based on HTTP_HOST

Question

I have two sites both being indexed by google using the same codebase:

dev.mysite.com and example.com

I want to serve a different robots.txt based on each domain.

Currently I have:

RewriteBase /

RewriteCond %{HTTP_HOST} ^dev\.mysite\.com$ [NC]
RewriteRule ^robots\.txt$ robots\.txt\.dev [L]

However this doesn't seem to work. Can someone point me in the right direction.

Answer 1

For me worked following by adding extra condition

RewriteCond %{HTTP_HOST} ^dev\.mysite\.com
RewriteCond %{REQUEST_URI} (robots\.txt)
RewriteRule .* robots-dev.txt [L]