HttpRequest HttpModule in the entire life cycle

Http Request start
                        |
                       HttpModule
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                     HttpModule.BeginRequest ()
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                HttpModule.AuthenticateRequest ()
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                      HttpModule.AuthorizeRequest ()
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                  HttpModule.ResolveRequestCache ()
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                    establish HttpHandler control point
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                then processes (HttpHandler has been established, then Session available)
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                  HttpModule.AcquireRequestState ()
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                HttpModule.PreRequestHandlerExecute ()
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                   enter HttpHandler handle the HttpRequest
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                    HttpHandler.ProcessRequest ()
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            return to HttpModule then processes (HttpHandler end of life, Session failure)
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                HttpModule.PostRequestHandlerExecute ()
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                HttpModule.ReleaseRequestState ()
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                HttpModule.UpdateRequestCache ()
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                    HttpModule.EndRequest ()
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                HttpModule.PreSendRequestHeaders ()
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                () HttpModule.PreSendRequestContent
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                    data will be processed back to the client
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                         end of the whole process Http Request

Life Cycle diagram:

Event Description:

event	Explanation
BeginRequest	It indicates that the request process is started.
AuthenticateRequest PostAuthenticateRequest	Package request authentication process.
AuthorizeRequest PostAuthorizeRequest	Package request authorization process.
ResolveRequestCache PostResolveRequestCache	Check whether the encapsulation process can use previously cached page output processing request.
PostMapRequestHandler	It has been found indicating the HTTP handler for processing requests.
AcquireRequestState PostAcquireRequestState	Package retrieval request session state.
PostRequestHandlerExecute	It indicates a HTTP handler processes the request has been executed.
ReleaseRequestState PostReleaseRequestState	Package release request session state.
UpdateRequestCache PostUpdateRequestCache	Checks whether the resource request package to deal with an output cache in preparation for future reuse process.
EndRequest	It indicates that the request process ends.

转载于:https://www.cnblogs.com/tufan/archive/2010/03/23/1692402.html