my $page_url = 'http';
if ($ENV{HTTPS} = "on") {
    $page_url .= "s";
}
$page_url .= "://";
if ($ENV{SERVER_PORT} != "80") {
    $page_url .= $ENV{SERVER_NAME}.":".$ENVSERVER_PORT}.$ENV{REQUEST_URI};
} else {
    $page_url .= $ENV{SERVER_NAME}.$ENV{REQUEST_URI};
}