移动设备上的 PHP 强制下载 header 失败

Question

Helo，我有这样的代码强制通过 URL(远程)从另一台服务器下载文件。

  $file_size = get_headers($url,TRUE);

  header('Pragma: public'); // required
  header('Accept-Ranges: bytes');
  header('Access-Control-Allow-Headers: accept, authorization');
  header('Access-Control-Allow-Methods: GET, HEAD');
  header('Access-Control-Allow-Origin: *');
  header('Content-Type: audio/mpeg');
  header("Content-Disposition:  attachment; filename=\"myfile.ogg\";" );
  //header('Content-Transfer-Encoding: binary');
  header('X-Cache: HIT');
  header('Content-Length: '.$file_size['Content-Length']);
  readfile($url);

此 PHP 代码在 PC 浏览器上运行良好(我使用的是 Ubuntu 14.04 和 Google Chrome 浏览器)。也适用于 wget，并通过 curl 下载。

但是，当我从我的手机(Android CyanogenMod ROM 4.4.4 与 google chrome 浏览器和 UC 网络浏览器)下载时，它在下载时总是说不成功(例如:当进度条达到 30%，下载失败)。

我正在使用 codeigniter 创建整个网站，当我尝试检查标题时，这就是结果。

HTTP/1.1 200 OK
Date: Fri, 20 Mar 2015 01:08:13 GMT
Server: Apache/2.4.7 (Ubuntu)
X-Powered-By: PHP/5.5.9-1ubuntu4.6
Set-Cookie: lagu_session=a%3A5%3A%7Bs%3A10%3A%22session_id%22%3Bs%3A32%3A%22c0bf700656a88ff98ddce8098c7ea1e3%22%3Bs%3A10%3A%22ip_address%22%3Bs%3A9%3A%22127.0.0.1%22%3Bs%3A10%3A%22user_agent%22%3Bs%3A11%3A%22curl%2F7.35.0%22%3Bs%3A13%3A%22last_activity%22%3Bi%3A1426813694%3Bs%3A9%3A%22user_data%22%3Bs%3A0%3A%22%22%3B%7D2c0017d813b89cb687b243a8a4c73771fe1c9083; expires=Fri, 20-Mar-2015 03:08:14 GMT; Max-Age=7200; path=/
Pragma: public
Accept-Ranges: bytes
Access-Control-Allow-Headers: accept, authorization
Access-Control-Allow-Methods: GET, HEAD
Access-Control-Allow-Origin: *
Content-Disposition: attachment; filename="myfile.ogg";
X-Cache: HIT
Content-Length: 4017422
Content-Type: audio/mpeg

是什么问题，有什么思路吗？

这条线会导致问题吗？

Set-Cookie: lagu_session=a%3A5%3A%7Bs%3A10%3A%22session_id%22%3Bs%3A32%3A%22c0bf700656a88ff98ddce8098c7ea1e3%22%3Bs%3A10%3A%22ip_address%22%3Bs%3A9%3A%22127.0.0.1%22%3Bs%3A10%3A%22user_agent%22%3Bs%3A11%3A%22curl%2F7.35.0%22%3Bs%3A13%3A%22last_activity%22%3Bi%3A1426813694%3Bs%3A9%3A%22user_data%22%3Bs%3A0%3A%22%22%3B%7D2c0017d813b89cb687b243a8a4c73771fe1c9083; expires=Fri, 20-Mar-2015 03:08:14 GMT; Max-Age=7200; path=/

仅供引用:当我的 friend 使用他们的手机下载时，没有错误。我手机有这个问题？我正在尝试从另一个网站下载一些文件，但我的手机没有问题。

感谢任何建议和解决方案:D

编辑:我认为这是服务器问题，我正在使用 openshift(免费计划)并遇到了这个问题。现在我将我的网络应用程序移至 DigitalOcean，它运行良好。

Answer 1

终于找到问题了，没有关于服务器的问题。这是我的代码 fragment

//check if http_range is sent by browser (or download manager)
if(isset($_SERVER['HTTP_RANGE']))
{
    list($size_unit, $range_orig) = explode('=', $_SERVER['HTTP_RANGE'], 2);
    if ($size_unit == 'bytes')
    {
        //multiple ranges could be specified at the same time, but for simplicity only serve the first range
        //http://tools.ietf.org/id/draft-ietf-http-range-retrieval-00.txt
        list($range, $extra_ranges) = explode(',', $range_orig, 2);
    }
    else
    {
        $range = '';
        header('HTTP/1.1 416 Requested Range Not Satisfiable');
        exit;
    }
}
else
{
    $range = '';
}

//figure out download piece from range (if set)
list($seek_start, $seek_end) = explode('-', $range, 2);

//set start and end based on range (if set), else set defaults
//also check for invalid ranges.
$seek_end   = (empty($seek_end)) ? ($header_content_size - 1) : min(abs(intval($seek_end)),($header_content_size - 1));
$seek_start = (empty($seek_start) || $seek_end < abs(intval($seek_start))) ? 0 : max(abs(intval($seek_start)),0);

//Only send partial content header if downloading a piece of the file (IE workaround)
if ($seek_start > 0 || $seek_end < ($header_content_size - 1))
{
    header('HTTP/1.1 206 Partial Content');
    header('Content-Range: bytes '.$seek_start.'-'.$seek_end.'/'.$header_content_size);
    header('Content-Length: '.($seek_end - $seek_start + 1));
}else{
header("Content-Length: $header_content_size");
}

header('Accept-Ranges: bytes');
@set_time_limit(0);

fseek($file, $seek_start);

while(!feof($file))
{
    print(@fread($file, 1024*8));
    ob_flush();
    flush();
    if (connection_status()!=0)
    {
        @fclose($file);
        exit;
    }
}

// file save was a success
@fclose($file);
exit;

现在，我的下载脚本支持可恢复下载。