HTTP文件下载：监控下载进度 [英] HTTP File Download: Monitoring Download Progress

问题描述

我在一个情况下，当我要实现的大型文件下载（最大支持4GB），从Web服务器：Apache通过HTTP协议2.4.4。我曾尝试多种方法，但最好的解决方案看起来为X-SENDFILE模块的使用。

I am in a situation, when I have to implement downloading of large files(up to 4GB) from a Web server: Apache 2.4.4 via HTTP protocol. I have tried several approaches, but the best solution looks to be the usage of X-SendFile module.

至于我提供文件上传进度条，我需要对文件下载相同的功能。因此，这里是我的问题：

As I offer progress bar for file uploads, I would need to have the same feature for file downloads. So here are my questions:

• 有什么办法，包括解决方法，实现文件下载进度监控？


• 有什么办法，包括解决方法，来计算文件下载传输速度？


• 有没有更好的办法，从除X-SENDFILE模块使用的Web服务器提供高效的文件下载？

有一般更好的文件下载选项，这将让我监视文件下载进度？它可以是在客户端（的JavaScript）或服务器溶液（PHP）。是否有允许这种任何特定的Web服务器？

Is there better file download option in general, that would allow me to monitor file download progress? It can be a client (JavaScript) or server solution(PHP). Is there any particular web server that allows this?

目前我使用的：

• 的Apache 2.4.4


• 的Ubuntu

很多次感谢。

推荐答案

2的想法（未验证）：

2 ideas (not verified):

第一：

而不是将常规链接文件（要下载），像您的网页链接的地方...的/ dowanload.php这可能看上去某事像这样：

Instead of placing regular links to files (that you want to download) on your page place links like .../dowanload.php which may look sth like this:

<?php

    // download.php file
    session_start(); // if needed

    $filename = $_GET['filename']);

    header( 'Content-type: text/plain' ); // use any MIME you want here
    header( 'Content-Disposition: attachment; filename="' . htmlspecialchars($filename) . '"' );
    header( 'Pragma: no-cache' );

    // of course add some error handling

    $filename = 'c:/php/php.ini';

    $handle = fopen($filename, 'rb');

    // do not use file_get_contents as you've said files are up to 4GB - so read in chunks
    while($chunk = fread($handle, 1000)) // chunk size may depend on your filesize
    {
        echo $chunk;
        flush();
        // write progress info to the DB, or session variable in order to update progress bar
    }

    fclose($handle);
?>

这样就可以在保持关注您的下载过程。在此期间，你可能会写入进度信息的DB /会话var和更新进度条当然使用轮询AJAX脚本来读取进度信息从DB /会话VAR读取状态。

This way you may keep eye on your download process. In the meantime you may write progress info to the DB/session var and update progress bar reading status from DB/session var using AJAX of course polling a script that reads progress info.

这是非常简单的，但我认为，只要你想它可能工作。

That is very simplified but I think it might work as you want.

二：

阿帕奇2.4内置了Lua的语言：

Apache 2.4 has Lua language built in:

• mod_lua


• 创建具有mod_lua
挂钩和脚本

• mod_lua
• Creating hooks and scripts with mod_lua

我敢打赌，你可以尝试写LUA Apache的处理程序，将监视您的下载 - 使用PHP / AJAX采取从DB进度信息发送进步到数据库和更新进度条

I bet you can try to write LUA Apache handler that will monitor your download - send progress to the DB and update progress bar using PHP/AJAX taking progress info from the DB.

相似 - 有Perl模块，甚至蟒蛇（而不是赢）

Similarly - there are modules for perl and even python (but not for win)

这篇关于HTTP文件下载：监控下载进度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！