I'm writing a modperl application (running under Apache::Registry) where i decided to serve images from the DB for various reasons. I got a simple CGI script to serve images, it looks like this:

use strict;
use lib '/path/to/my/lib/';
use MyDBI; #export $dbh
use CGI qw(header path_info);

my ($id, $image) =
     path_info() =~ m{(\d+)_((?:image|thumb|mini)[1-3])(_.+)?\.jpe?g$}
+i;

exit unless $id and $image;

my ($file) =  $dbh->selectrow_array("SELECT $image from offerte WHERE 
+id=$id");

exit unless $file;

print header(-type => 'image/jpeg', -Content_length => length $file), 
+$file;
[download]

This is working fine except for caching. Browsers keeps on asking conditional GETs sending If-Modified-Since fields.
As the filenames changes if the image changes all i want to do is just replying a 304 header if i receive a conditional GET.
Can i do it with a simple script like mine, do i have to use Apache API or do i have to install an Apache handler?

$|=$_="1g2i1u1l2i4e2n0k",map{print"\7",chop;select$,,$,,$,,$_/7}m{..}g