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just when I finally understood the difference between Msxml2.XMLHTTP and Msxml2.ServerXMLHTTP
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.
suddenly I find 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.
so, how is this different from Msxml2.ServerXMLHTTP
(well, the implicit question is which one should I use...)
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The ServerXMLHTTP object is commonly used to: Receive XML documents from an Active Server Pages (ASP) page on a local or remote Web server (HTTP GET ). Post XML documents to an ASP page on a local or remote Web server (HTTP POST ). Post and process response XML documents from an ASP page (HTTP POST ).
The WinHttpRequest object uses the IErrorInfo interface to provide error data. A description and numerical error value can be obtained with the Err object in Microsoft Visual Basic Scripting Edition (VBScript), and the Error object in Microsoft JScript.
Msxml2.XMLHTTP and Msxml2.ServerXMLHTTP are two components share the similar interface for fetching XML files over HTTP protocal. The former is built upon URLMon, which relies on WinINet. The later is built upon WinHTTP, which is a server friendly replacement for WinINet. To put it simple - ServerXMLHTTP = XML + WinHTTP.
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