通訊協議：HTTP、TCP、UDP

http://blog.jobbole.com/84429/
http://www.cnblogs.com/renyuan/archive/2013/01/19/2867720.html
http://blog.csdn.net/sundacheng1989/article/details/52437128

WEB服務器、應用程序服務器、HTTP服務器區別: http://m.blog.csdn.net/article/details?id=11158349