I am storing my sitemaps in my web folder. I want web crawlers (Googlebot etc) to be able to access the file, but I don't necessarily want all and sundry to have access to it.
For example, this site (superuser.com), has a site index - as specified by its robots.txt file (http://superuser.com/robots.txt).
However, when you type http://superuser.com/sitemap.xml, you are directed to a 404 page.
How can I implement the same thing on my website?
I am running a LAMP website, also I am using a sitemap index file (so I have multiple site maps for the site). I would like to use the same mechanism to make them unavailable via a browser, as described above.