use IO::Compress::Zip qw(:all) ;

select STDOUT;
$| = 1;

my $OUT = \*STDOUT;               

print <<EOM;
Status: 200 OK
Content-Type: application/zip
Transfer-Encoding: chunked

EOM

my @files = qw(/tmp/file1 /tmp/file2) ;
zip [@files] => '-',
        FilterName => sub
            {
               if ($DLWOSC eq "checked"){
                 $_=(split('/',$_))[-1];
                 s/\;/\_/g;
                }
            }, 
        FilterEnvelope => sub         
            { 
                # Chunk the output
                my $length = length($_);
                $_ = sprintf("%x", $length) . "\r\n" . $_ . "\r\n";
                $_ .= "\r\n" unless $length;
                1;
            }
        ;