Converter diretório para url em RecursiveDirectoryIterator

$iterator = new RecursiveIteratorIterator( 
    new RecursiveDirectoryIterator( 
        ABS_PATH.'/uploads/'
    ),
    RecursiveIteratorIterator::SELF_FIRST
);
foreach($iterator as $file) { 
    if($file->isDir()) continue;
    $real_path = $file->getRealPath();
    $real_path = str_replace("\\", "/", $real_path);
    $URL = str_replace($_SERVER["DOCUMENT_ROOT"], $_SERVER["SERVER_NAME"], $real_path);
    $protocol = isset($_SERVER["HTTPS"]) ? 'https://' : 'http://';
    $URL = $protocol.$URL;
    echo '<img src="'.$URL.'" alt="" />';
}