Hmmm. OK for yourself on localhost I guess, but if you go to a folder/ as opposed to folder/file Apache might - depending on DirectoryIndex setting - show something like
Probably not something you want on a live site.
You can add that to the htaccess file, although if you know the mod_headers module is there you should remove that "IfModule" as Apache parses the htaccess file every request and you can save on some resource use without it.
If you keep it, don't forget to close it with