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3.本地浏览器——代理服务器（squid）——远程服务器（RS）
在这种数据流下，我们来想想工作的原理一下，本地浏览器需要获取一个url上的数据，然后将这个HTTP请求发送给squid，squid将这个HTTP请求变成自己的请求来发送给RS。然后squid获取到数据，并将这个数据返回给本地浏览器。所以我们要明确以下几个重要的概念：
1.对于RS来说，访问RS的是squid；与本地浏览器没有任何直接关联。
2.对于squid来说，HTTP请求如果返回了304，那么squid将从自身获取缓存的数据；如果HTTP请求返回200则squid要从RS上获取新的数据。
3.对于本地浏览器来说，如果HTTP返回了304，那么我获得的数据是squid缓存的数据；如果获取的是200，则表示这个数据是squid从RS上获取的新数据，然后再传递给我的，相当于是一个新数据。
明白了以上行为，在看第4个问题：
4.浏览器刷新行为
不同的浏览器的刷新行为所发送的头信息是不一样的，假定上一次服务器返回了Last_Modified和
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原文地址：http://blog.csdn.net/starplayer/article/details/46320209
