sub handler {
    my $r = shift;

    # use the path_info to determine which template file to process
    my $file = $r->unparsed_uri;

    # validate the url as a content page
    my $tt_path = $nav->get_path_attribute("/$file", 'local_path');
    $tt_path =~ s[^/][];

    return -1 if ! $tt_path; # Decline this request if the path isn't in the nav



    # set up and call the template
    my $template = Template->new({ 
        PLUGIN_BASE => 'MyOrg::Template::Plugin',
        INCLUDE_PATH  => "$websrc:$websrc\\lib",
        PRE_PROCESS   => 'config',
        OUTPUT        => $r,     # direct output to Apache request
    });

    my $params = {
        uri     => $r->uri,
        navigation => $nav,
    };


    $r->content_type('text/html');
    $r->headers_out->add('Set-Cookie' => "CGISESSID=PLEASEWORK; path=/");


    $template->process($tt_path, $params) 
        || return fail($r, 500, $template->error()); ## 500 -> SERVER_ERROR


    return 0;  # OK
}