Sometimes you want to place a Gantry controller at the base location ( "/" ) of your web server, but you don't want it to execute for every image, js, css, etc. A simple solution is to short circuit the dispatching by using LocationMatch and adding the exclusions.
For example, this configuration sets a controller at the base location. However, the controller will not get triggered when requests come in that start with "/Apps-Blogger". This works great for me since I have all my static content located in /Apps-Blogger
<LocationMatch ^/(?!Apps-Blogger)>
PerlSetVar GantryConfInstance blogger_prod
PerlSetVar GantryConfFile /etc/gantry.conf
SetHandler perl-script
PerlHandler Apps::Blogger
</LocationMatch>