I looked at the man page for HTTP::headers and it isn't realy clear as to how to use it. I'm used to mod_perl and not doing cgi without it. My best guess:

my $h = new HTTP::Headers
               Content_Type => 'text/html',
               Location => 'http://foo.com';

print $h->as_string,"\n\n";
[download]

Since I'm assuming that your stuff is being handled by the server you only need to output a partial header. The two newlines will separate the content of the page as required. This is the best that I can do since I realy don't know what your trying to do except use HTTP::headers to do what it does best. Read the man page on how to use it. I hope I've given you a nudge in the right direction.

BMaximus