说明：  用C++实现的HTTP Web下载，两种方式实现： 1.WinInet（这种方式很简单，但不是很灵活） 2.WinSock（也就是Socket，这种方式有点繁琐，但是可以自定义发送HTTP的报文头和接收响应头，很灵活） 因作者编程水平有限，错误之处，在所难免，欢迎批评指正。
(Using C++ to achieve the HTTP Web download, the realization of two ways: 1.WinInet (in this way is very simple, but it is not very flexible) 2.WinSock (that is, Socket, in this way a bit tedious, but you can customize the report to send HTTP text first and receive the first response, it is flexible) due to limited programming author, wrong, the inevitable criticism welcome.)