You could use the URI module to construct your GET method by doing:

use URI;
$uri = URI->new("http://mysite/cgi/query.pl")->canonical;
$uri->query_form(var1 => 'VAR1', var2 => 'VAR2');
$content = get($url);
[download]

Where var1/var2 are the CGI variables. The beauty of this method is that the variables are automatically escaped.