$last_modified = $now if $now - $last_modified < 3600;
if ($input->http('If-Modified-Since') and
- (my $modtime = str2time($input->http('If-Modified-Since'), 'UTC'))) {
- if ($modtime <= $last_modified) {
+ (my $client_timestamp = str2time($input->http('If-Modified-Since'), 'UTC'))) {
+ if ($client_timestamp >= $last_modified) {
+ # we are not modified since asked -> return "304 Not Modified"
print $input->header(-status => 304);
exit;
}