httpwebrequest - Msxml2.ServerXMLHTTP 和 WinHttp.WinHttpRequest 之间的区别？

Question

就在我终于明白 Msxml2.XMLHTTP 和 Msxml2.ServerXMLHTTP 的区别的时候

http://support.microsoft.com/kb/290761

XMLHTTP is designed for client applications and relies on URLMon, which is built upon Microsoft Win32 Internet (WinInet). ServerXMLHTTP is designed for server applications and relies on a new HTTP client stack, WinHTTP. ServerXMLHTTP offers reliability and security and is server-safe. For more information, see the MSXML Software Development Kit (SDK) documentation.

突然我发现 WinHttp.WinHttpRequest ......

http://msdn.microsoft.com/en-us/library/aa382925(VS.85).aspx

Microsoft Windows HTTP Services (WinHTTP) provides developers with a server-supported, high-level interface to the HTTP/1.1 Internet protocol. WinHTTP is designed to be used primarily in server-based scenarios by server applications that communicate with HTTP servers.

那么，这与 Msxml2.ServerXMLHTTP 有何不同

(嗯，隐含的问题是我应该使用哪一个......)

Answer 1

Msxml2.XMLHTTP 和 Msxml2.ServerXMLHTTP 是两个组件，它们共享相似的接口(interface)，用于通过 HTTP 协议(protocol)获取 XML 文件。前者建立在 URLMon 之上，后者依赖于 WinINet。后者基于 WinHTTP，它是 WinINet 的服务器友好替代品。简单地说——ServerXMLHTTP = XML + WinHTTP。