php下载代码在苹果无效，怎么解决？403.10 禁止访问：配置无效 

@ini_set("memory_limit","128M");         //开始下载文件         header('Content-Description: File Transfer');         header('Content-Type: application/octet-stream');  header('Content-Disposition: attachment; filename='.$name.'.'.$downInfo['ext']);         header('Content-Transfer-Encoding: binary');         header('Expires: 0');         header('Cache-Control: must-revalidate, post-check=0, pre-check=0');         header('Pragma: public');         header('Content-Length: ' . filesize($file));         ob_clean();         flush();         readfile($file);   这段代码在谷歌、安卓手机都能下载，苹果手机却不能下载了，怎么解决呀？