gzencode and stream http archive

<?php
    function gzencode_and_stream_http_archive() {
        function get_current_url() {
            $pageURL = 'http';
            if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on") {
                $pageURL .= "s";
            }
            $pageURL .= "://";
            if ($_SERVER["SERVER_PORT"] != "80") {
                $pageURL .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];
            } else {
                $pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
            }
            return $pageURL;
        }
        $url = get_current_url();
        header("Content-Type: application/x-gzip");
        header("Content-Disposition: attachment; filename=web.archive");
        $curl = curl_init();
        curl_