的.htaccess：如何与QUOT;指定缓存验证及QUOT;？

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我在我的网站上运行谷歌PageSpeed​​和它的告诉我，我需要 指定缓存验证。

I'm running Google PageSpeed on my site and it's tell me that I need to "Specify a cache validator."

以下资源缺少缓存验证。不指定缓存验证资源不能有效地刷新。指定一个Last-Modified或ETag头启用缓存验证以下资源：

The following resources are missing a cache validator. Resources that do not specify a cache validator cannot be refreshed efficiently. Specify a Last-Modified or ETag header to enable cache validation for the following resources:

...然后列出图片，CSS，JS等。

... then it lists images, CSS, JS, etc.

据$c$c.google/speed/page-speed/docs/caching.html#LeverageBrowserCaching:

设置Last-Modified日期，以最后一次资源被改变。如果Last-Modified日期足够远不够，在过去，很可能是浏览器不会重新读取它。

Set the Last-Modified date to the last time the resource was changed. If the Last-Modified date is sufficiently far enough in the past, chances are the browser won't refetch it.

我在我的.htaccess如下：

I have the following in my .htaccess:

<IfModule mod_headers.c> <FilesMatch "\.(bmp|css|flv|gif|ico|jpg|jpeg|js|pdf|png|svg|swf|tif|tiff)$"> Header set Last-Modified "Tue, 31 Aug 2010 00:00:00 GMT" </FilesMatch> </IfModule>

我是什么做错了吗？

What am I doing wrong?

推荐答案

我想你遇到的问题是过期：而不是上次修改：。阿帕奇将在默认情况下发送的文件的Last-Modified：基于文件的日期头。我建议拆除上部code和具有以下替换它：

I think the problem you are having is with Expire: and not with Last-Modified:. Apache would by default send the file Last-Modified: header based on the file date. I suggest removing the upper code and replacing it with the following:

<IfModule mod_expires.c> ExpiresActive On ExpiresDefault "access plus 1 year" </IfModule>

尝试使用，如果它没有工作，尝试添加这个问题，以及：

Try with that, if it didn't work try adding this as well:

<IfModule mod_headers.c> <FilesMatch "\.(bmp|css|flv|gif|ico|jpg|jpeg|js|pdf|png|svg|swf|tif|tiff)$"> Header set Last-Modified "Mon, 31 Aug 2009 00:00:00 GMT" </FilesMatch> </IfModule>