Apache PHP利用HTTP缓存协议原理解析及应用

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Apache PHP利用HTTP缓存协议原理解析及应用_PHP

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Jun 01, 2016 pm 12:20 PM

Apache

http协议里控制浏览器缓存的头有三个Cache-Control，Expires，Last-Modified

对于静态页面还有Etag。

一、先来看第一种情况：apache 静态页面

apache发送给客户端的静态页面一般包含Last-Modified和Etag，这两个标签的值来自静态文件的修改时间和inode。

下面是截取得apache返回客户端的头

---------
Last-Modified: Fri, 26 Jan 2007 01:53:34 GMT
ETag: "3f9f640-318-cb9f8380"
---------

搜索引擎之所以喜欢静态文件是因为有这两个标识，可以判断文件是否更新过

二、PHP等动态页面

由于php是动态生成的，它的内容是不能根据php程序的时间来确定最后修改日期，所以默认php返回客户端的时候补包含任何缓存控制，要想利用好缓存就必须了解缓存机制，和理减少b,s的交互，缩减带宽流量，减轻服务器负担...好处多多。

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