Can apache use the Alias directive to fetch a file?
Solution 1:
Yes you can - the config for the Alias directive says:
Syntax: Alias URL-path file-path|directory-path
So you can have a directive such as:
Alias /robots.txt /path/to/robots.txt
Solution 2:
You could use mod_rewrite. Here is a good tutorial explaining how it works and how to use it:
http://articles.sitepoint.com/article/guide-url-rewriting