原文：https://msdn.microsoft.com/zh-cn/library/windows/desktop/aa384273(v=vs.85).aspx
Purpose （目的）
Microsoft Windows HTTP Services (WinHTTP) provides developers with an HTTP client application programming interface (API) to send requests through the HTTP protocol to other HTTP servers.
WinHTTP 提供了开发 HTTP 客户端应用程序的接口（API），用户可以能过这些API 以 HTTP 协议访问 HTTP 服务。
Where applicable 适用场景
WinHTTP supports desktop client applications, Windows services, and Windows server-based applications.
WinHTTP 支持桌面应用，Windows 服务和基于服务器的应用程序。
For more information on how to use WinHTTP for applications built on the Microsoft .NET Framework, see the WinHttpHandler API
在 .NET 中怎样使用 WinHTTP 构建应用程序方法请参考 WinHttpHandler API 。
Developer audience
WinHTTP offers both a C/C++ application programming interface (API) and a Component Object Model (COM) automation component suitable for use in Active Server Pages (ASP) based applications.
WinHTTP 为 ASP 应用程序提供了 C/C++ API 和 COM 两种技术。
A basic understanding of the HTTP protocol is important to use either interface.
在使用这二种接口时，对 HTTP 协议需要有一定的了解。
Run-time requirements 运行时要求
WinHTTP 5.1 offers improvements over version 5.0. It is included in the operating system. For more information about new features, see What’s New in WinHTTP 5.1 and What’s New in Windows Server 2008 and Windows Vista.
WinHTTP 5.1 相对于 5.0 版本有一定的改进，它包含在操作系统中。关于它的更多的新的特性，请查看 WinHTTP 5.1（https://msdn.microsoft.com/zh-cn/library/windows/desktop/aa384086(v=vs.85).aspx）。
其它内容
About WinHTTP https://msdn.microsoft.com/zh-cn/library/windows/desktop/aa382925(v=vs.85).aspx
Using WinHTTP https://msdn.microsoft.com/zh-cn/library/windows/desktop/aa384081(v=vs.85).aspx
WinHTTP Reference https://msdn.microsoft.com/zh-cn/library/windows/desktop/aa384263(v=vs.85).aspx
