Jetpack::xmlrpc_api_url PHP Method

    public static function xmlrpc_api_url()
    {
        $base = preg_replace('#(https?://[^?/]+)(/?.*)?$#', '\\1', JETPACK__API_BASE);
        return untrailingslashit($base) . '/xmlrpc.php';
    }

 function __construct($args = array(), $path = false, $port = 80, $timeout = 15)
 {
     $defaults = array('url' => Jetpack::xmlrpc_api_url(), 'user_id' => 0);
     $args = wp_parse_args($args, $defaults);
     $this->jetpack_args = $args;
     $this->IXR_Client($args['url'], $path, $port, $timeout);
 }