private static function _get_file_url( $base, $subdir, $filename, $absolute ) {
		$url = '';
		if ( self::BASE_UPLOADS == $base ) {
			$upload_dir = wp_upload_dir();
			$url = $upload_dir['baseurl'];
		}
		if ( self::BASE_CONTENT == $base ) {
			$url = content_url();
		}
		if ( !empty($subdir) ) {
			$url .= $subdir;
		}
		$url .= '/'.$filename;
		if ( !$absolute ) {
			$url = str_replace(site_url(), '', $url);
		}
		// $url = TimberURLHelper::remove_double_slashes( $url);
		return $url;
	}