Page caching - rewrite rules/ trailing slash question

Hi,
I was wondering if anyone has run into this issue in which trailing
slashes
are triggering the controller/action instead of serving the cached
page in the public/ directory.

For example
www.myhost.com/controller/action - will serve up
public/controller/action.html
but www.myhost.com/controller/action/ - will run the action again.

I’m quite newbie with the entire Apache mod_rewrites.

Thanks,

Ben