# call header to instantiate CGI object, but throw away the result
$sess->header();
# _now_ print the header
print $sess->header(expires => '+1M');
__END__
output:
Set-Cookie: CGISESSID=e438a0cb3647f362bd9934d048dca443; path=/
Expires: Mon, 18 Oct 2004 21:52:43 GMT
Date: Mon, 18 Oct 2004 21:42:43 GMT
Content-Type: text/html; charset=ISO-8859-1