Windows HTTP Services
WinHTTP supports desktop client applications, Windows services, and Windows server-based applications.
For more information on how to use WinHTTP for applications built on the Microsoft .NET Framework, see the WinHttpHandler API
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.
A basic understanding of the HTTP protocol is important to use either interface.
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.