https://my.oschina.net/xianggao/blog/678644
http://www.cnblogs.com/ggjucheng/archive/2012/02/02/2335495.html
http://www.jianshu.com/p/2461535c38f3
http://www.cnblogs.com/skynet/archive/2010/12/12/1903949.html
http://www.cleey.com/blog/single/id/788.html
http://c.biancheng.net/cpp/html/3029.html
http://zhing.github.io/2014/04/23/C/
http://docs.linuxtone.org/ebooks/C&CPP/c/ch37s02.html
http://blog.csdn.net/scenlyf/article/details/52138969 非常详细，棒
http://lifeofzjs.com/blog/2015/05/16/how-to-write-a-server/ 如何写一个web服务器