http request response头信息介绍
http://wenku.baidu.com/view/d9e28c1dfad6195f312ba613.html
持久连接、非持久连接区别
http://book.51cto.com/art/201108/282330.htm
w3.org
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.32
http协议详解
http://www.cnblogs.com/TankXiao/archive/2012/02/13/2342672.html#statelessalive
fish 细说aspnet缓存
http://www.cnblogs.com/fish-li/archive/2012/01/11/2320027.html
cache-control
http://czy4411741.blog.163.com/blog/static/3420312720102931720414/
cache-control介绍