1: http://www.codesky.net/article/201008/118335.html
2: http://www.codesky.net/article/201011/174903.html
3:http://www.php100.com/html/program/nginx/2013/0905/5525.html
4:http://www.cnblogs.com/skyblue/archive/2013/05/14/3077334.html
5:http://blog.sina.com.cn/s/blog_490eec930100d0fs.html