any ['get', 'post'] => '/viewscript' => sub {
    
    set_cookie name => 'return_page', value => '/viewscript';
    
    if ( request->is_get() ) {
        forward "/selectscript";
    }
}

any ['get', 'post'] => '/selectscript' => sub {

    my $return_page = cookies->{ return_page };
    print $return_page;
    
}