问题描述
这是昨晚工作的，但我一定是不小心改变了一些东西，因为现在不是.
This was working last night, but I must have accidentally changed something, because it isn't now.
从这些标题中应该清楚我想要做什么:
What I am trying to do should be clear from these headers:
Content-Disposition: attachment;filename=english_customizable.xml
Location: http://tortoisewrath.com/files/2.xml
但是，当发送此标头时，Content-Disposition 部分在重定向后不起作用.
However, when this header is sent, the Content-Disposition part doesn't work after the redirect.
...为什么?
推荐答案
你试图做的是不明智的检查这个问题;标头位置 + 内容处置
What you're trying to do is inadvisable check this question; Header Location + Content Disposition
Content-Disposition + Location 标头
但是您可以做到，要使其正常工作，您必须在发送之前缓冲整个响应.您可以通过输出缓冲来做到这一点
But you can do it, to make it work you will have to buffer your whole response before sending it. You can do this with output buffering
- http://php.net/manual/en/book.outcontrol.php
否则浏览器可能会在下载文件之前解释 Location 标头.无论哪种方式都很粗略，所以你不应该这样做.
Else the browser may interpret the Location header before the file is downloaded. It's sketchy either way, so you shouldn't want to do this.
请注意使用 Content-Disposition: attachment; 强制另存为"将确保客户端不会去/导航任何地方，所以下面的方法无论如何，它自己应该没问题.
Please note that forcing 'save as' using Content-Disposition: attachment; will make sure the client doesn't go/navigate anywhere, so the method below on its own should be fine in any case.
在 php 中流式传输文件
仅引用 一个聪明的人:
// To use header() with 'content-type', why don't you use mime_content_type() function rather than checking the type on the basis of extension?
// Example code:
<?php
$file="test.docx";
header("Pragma: public");
header('Content-disposition: attachment; filename='.$file);
header("Content-type: ".mime_content_type($file));
header('Content-Encoding: identity');
ob_clean();
flush();
readfile($file);
?>
// Use $file to map to whichever type of file.
// Note: the mime types should already be defined in apache settings
来源:http://www.php.net/manual/zh/function.header.php#107581
请注意，原始答案使用了 HTTP 中实际上不存在的 Content-Transfer-Encoding.该来源下方的评论对此进行了解释:http://www.php.net/manual/en/function.header.php#107044
Note that the original answer used Content-Transfer-Encoding which doesn't actually exist in HTTP. The comment below that source explains it: http://www.php.net/manual/en/function.header.php#107044
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