穿透代理服务器编程 http://blog.youkuaiyun.com/snail8384/article/details/3613373
透过代理看世界 用VC++实现http代理 http://school.cnd8.com/c/jiaocheng/8706.htm
CAsyncProxySocket - CAsyncSocket derived class to connect through proxies: http://www.codeproject.com/Articles/1652/CAsyncProxySocket-CAsyncSocket-derived-class-to-co