HTTP标头“内容类型:应用程序/强制下载"的实用程序；为手机? [英] Utility of HTTP header "Content-Type: application/force-download" for mobile?
问题描述
我目前正在开发一个 PHP 脚本，该脚本允许您通过访问链接从您的移动设备下载媒体内容(视频、音频、图片...).(即 http://www.my-web-site.com/download.php?id=7ejs8ap)当我用最近的手机(三星 Galaxy S、iPhone 4S、其他一些……)测试它时，我的脚本运行良好，但在我的旧手机三星 C3050 上出现错误.我想下载的媒体只是一个音频mp3文件，我通常很容易下载.
I am currently working on a PHP script that allows you to download media contents (video, audio, pictures...) from your mobile device by accessing a link. (i.e. http://www.my-web-site.com/download.php?id=7ejs8ap) My script worked very vell when I was testing it with recent mobile (Samsung Galaxy S, iPhone 4S, some others...) but an error occured on my old mobile Samsung C3050. The media I wanted to download was just an audio mp3 file that I usually download easily.
错误似乎是未知的内容类型".因此，由于我唯一的 HTTP 标头 Content-Type 是application/force-download"，我尝试对此发表评论并重试.然后，它起作用了.但是现在，我目前正在问这个 Content-Type 是什么意思，以及它是否可以强制用于其他移动设备.我在 iPhone 4 上没有使用 Content-Type 进行测试，它可以工作，但我不确定这种兼容性是否适用于所有移动设备.
The error appears to be "Unknown content type." So, as my only HTTP header Content-Type was "application/force-download", I try to comment this and try again. Then, it works. But now, I am currently asking what this Content-Type means and if it can be mandatory for others mobile. I tested without the Content-Type on the iPhone 4 and it works, but I'm not sure of this compatibility for all mobile.
有人可以向我解释一下 Content-Type 是如何工作的，为什么这不是标准 MIME 或其他所有可以帮助我确保这是每次下载的可选 Content-Type，无论文件、浏览器或我正在下载的设备?
Can someone explain me how that Content-Type works, why this isn't a standard MIME or everything else that can help me to be sure this is an optionnal Content-Type for every download, whatever the file, the browser or the device I am downloading on?
谢谢大家.
这是我发送的 PHP 标头:
Here is my PHP headers sent:
<?php
//Assume that $filename and $filePath are correclty set.
header('Content-Description: File Transfer');
header('Content-Disposition: attachment; filename="'.$filename.'"');
// header('Content-Type: application/force-download'); Non-standard MIME-Type, incompatible with Samsung C3050 for example. Let it commented
readfile($filePath);
?>
我刚刚尝试使用 Sony Xperia，但下载不成功:我只看到我想要下载的文件的html 编码"字节.如果 application/octet-stream 或 application/force-download 不起作用，我怎么知道我必须使用什么内容类型?
EDIT : I just tried with a Sony Xperia, and the download wasn't successful: I only see the "html-encoded" bytes of my file I want to download. How can I know what content-type I have to use if application/octet-stream or application/force-download doesn't work?
推荐答案
Content-Type: application/force-download 的意思是我，网络服务器，会骗你(浏览器) 了解此文件是什么，这样您就不会将其视为 PDF/Word 文档/MP3/任何内容，而是提示用户将神秘文件保存到磁盘".这是一个肮脏的黑客，当客户端不执行保存到磁盘"时会严重破坏.
Content-Type: application/force-download means "I, the web server, am going to lie to you (the browser) about what this file is so that you will not treat it as a PDF/Word Document/MP3/whatever and prompt the user to save the mysterious file to disk instead". It is a dirty hack that breaks horribly when the client doesn't do "save to disk".
为您使用的任何媒体使用正确的 mime 类型(例如 audio/mpeg 用于 mp3).
Use the correct mime type for whatever media you are using (e.g. audio/mpeg for mp3).
使用Content-Disposition:附件；etc etc 标头，如果您想鼓励客户端下载它而不是遵循默认行为.
Use the Content-Disposition: attachment; etc etc header if you want to encourage the client to download it instead of following the default behaviour.
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