总是在Apache中发送内容长度？ [英] Always send Content-Length in Apache?

问题描述

我加载了动态由PHP生成一个特别大的JSON字符串。提供一些反馈给用户，我想显示下载进度。

I'm loading a particularly large JSON string that is dynamically generated by PHP. To provide some feedback to the user, I want to show download progress.

我有code想通了，这对静态内容，如图像，JS文件等，但做工精细，它似乎并不为动态文件。

I have the code figured out, and it works fine for static content such as images, JS files, etc. However, it doesn't seem to work for dynamic files.

这是有道理的，因为动态文件没有predictable内容长度，但即使我在PHP补充一点：

This makes sense, since the dynamic files don't have predictable content length, but even if I add this in PHP:

ob_start(function($c) {
    header("Content-Length: ".strlen($c));
    return $c;
});

它仍然不发送头（但如果我添加任何其他的头它工作正常）。

It still does not send the header (but if I add any other header it works fine).

有没有办法强迫阿帕奇发送的Content-Length 头？目前我唯一的选择就是将输出保存到临时文件，并重定向到它，而不是。这会工作，但它是一种混乱的，所以如果可能，我宁愿避免它。

Is there any way to force Apache to send the Content-Length header? Currently my only alternative is to save the output to a temporary file and redirect to it instead. This would work, but it's kind of messy so I'd rather avoid it if possible.

推荐答案

我有类似的问题，但对我来说Content-Length头，因为反应是gzip的COM pressed不是由Apache的发送。当我禁用COM pression的内容长度计算和发送正常。

I had similar problem but in my case Content-Length header wasn't sent by Apache because the response was gzip compressed. When I disable compression the Content-Length was calculated and sent properly.

下面是htaccess的设置来禁用gzip的COM pression的SWF文件只

Below is htaccess setting to disable gzip compression for swf file only

<FilesMatch "\.swf$">
  SetEnv no-gzip 1
</FilesMatch>

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