php – 从外部URL下载文件,并直接将文件传递给用户,而不将其保存在我的服务器上.

基本上我想从外部主机下载文件并将其直接传递给用户而不必保存在服务器上,实际上,充当该文件的代理,以便始终从我的服务器发出请求而不是用户.
我应该模拟这个请求：

GET / servername / filename.ext HTTP/1.1 (any large file) 
Host: namehost 
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv: 27.0) Gecko/20100101 Firefox/27.0 
Accept: text / html, application / xhtml + xml, application / xml; q = 0.9, * / * q = 0.8 
Accept-Language: en-us, en; q = 0.8, en-US; q = 0.5, en; q = 0.3 
Accept-Encoding: gzip, deflate 
Referer: sitename / ... 
Cookie: .... 
Connection: keep-alive

我已经有了必要的cookie和所有必需的标题,但我无法开始下载,我尝试在Curl中使用不同的脚本,但下载没有开始.

任何人都可以帮助我.

解决方法:

您想从远程服务器获取文件并将其提供给您的用户.以下是获取和服务代理示例代码.我希望你知道文件名,URL,文件扩展名和mime类型

<?PHP
function get_size($url) {
    $my_ch = curl_init();
    curl_setopt($my_ch, CURLOPT_URL,$url);
    curl_setopt($my_ch, CURLOPT_HEADER, true);
    curl_setopt($my_ch, CURLOPT_NOBODY, true);
    curl_setopt($my_ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($my_ch, CURLOPT_TIMEOUT, 10);
    $r = curl_exec($my_ch);
    foreach(explode("\n", $r) as $header) {
        if(strpos($header, 'Content-Length:') === 0) {
            return trim(substr($header,16));
        }
    }
    return '';
}
// Set operation params
$mime = filter_var($_GET['mime']);
$ext = str_replace(array('/', 'x-'), '', strstr($mime, '/'));
$url = base64_decode(filter_var($_GET['url']));
$name = urldecode($_GET['title']). '.' .$ext;

// Fetch and serve
if ($url)
{
$size=get_size($url);
// Generate the server headers
if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE)
{
header('Content-Type: "' . $mime . '"');
header('Content-disposition: attachment; filename="' . $name . '"');
header('Expires: 0');
header('Content-Length: '.$size);
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header("Content-transfer-encoding: binary");
header('Pragma: public');
}
else
{
header('Content-Type: "' . $mime . '"');
header('Content-disposition: attachment; filename="' . $name . '"');
header("Content-transfer-encoding: binary");
header('Expires: 0');
header('Content-Length: '.$size);
header('Pragma: no-cache');
}

readfile($url);
exit;
}

// Not found
exit('File not found');
?>

用法：简单地将其保存为download.PHP并调用如

$encoded_url =  base64_encode($file_to_download_url);
$download_url = 'http://www.example.com/download.PHP?mime='.$mime.'&title='.$title.'&url='.$encoded_url;

它会像魅力一样工作！

php – 从外部URL下载文件,并直接将文件传递给用户,而不将其保存在我的服务器上.

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