Given the following Apache rewrite rule:
RewriteRule .* foo
...how do I find out precisely what string .* is testing against? Assume that any number of arbitrary rewrite rules could have been applied before this point, and that I have no way of knowing what they are (assume httpd.conf is hidden from me).
EDIT: Thanks, though keep in mind that I do not have access to edit (or even read!) httpd.conf. I only have .htaccess files at my disposal.