Hi Mark,

As for the HTTP.SYS, it is a kernal mode component which serve as a network
facade on the operating system. Yes, it is first introduced in windows 2003
server and integrated with IIS6. After sp2, windows xp is also equiped with
this http.sys component. However, since IIS remain version 5, it doesn not
be integrated with http.sys. However, windows HTTP API and the .net
framework  HttpListener class does utilize this kernal model component.
Here is a article mentioend this:

#Http.sys in WinXP SP2: What It Means with Windows Communication Foundation

http://dotnetjunkies.com/Article/99DD7042-532D-4DB4-8625-1CD8BF422D64.dcik

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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