Pipeline architecture

ASP.NET uses the CLR to replace IIS's ISAPI/ASP architecture

–User-defined handler objects used to dispatch HTTP requests

–Requests dispatched through ASP.NET-provided ISAPI extension (aspnet_isapi.dll)

–Handlers run in an ASP.NET-provided worker process (aspnet_wp.exe in IIS 5, w3wp.exe in IIS 6)

–Many IIS features bypassed in favor of ASP.NET-provided features (WAM-based process isolation, ASP object model, and session management)

HttpPipeline architecture (IIS 5.0)

HttpPipeline architecture (IIS 6.0)

Windows server 2003

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