我有静态内容（.jpg）与服务器端缓存内容（.jpg也混合的页面）。
<body>
// Static content, "never change"
<img src="my_static_image.jpg">
// This image change every 6 hours, its name will not change.
<img src="changing_image.jpg">
<body>
我想优化加载和引用仅更改的内容，而不是其余内容。就我而言，changing_image.jpg保持相同的名称，但在服务端每 6 小时重新生成一次。
在 http://www.askapache.com/htaccess/speed-up-sites-with-htaccess-caching.html#Apache_htaccess_caching_code 上找到
<FilesMatch "/static/"> <-- this is regex, you can match by filename rather than by extention
Header set Cache-Control "max-age=29030400, public" <-- longer
</FilesMatch>
<FilesMatch "/changing/"> <-- this is regex, you can match by filename rather than by extention
Header set Cache-Control "max-age=21600, public" <--6 hours in seconds
</FilesMatch>