Http Request开始
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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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建立HttpHandler控制点
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接着处理（HttpHandler已经建立,此后Session可用)
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HttpModule.AcquireRequestState()
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HttpModule.PreRequestHandlerExecute()
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进入HttpHandler处理HttpRequest
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HttpHandler.ProcessRequest()
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返回到HttpModule接着处理（HttpHandler生命周期结束，Session失效）
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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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将处理后的数据返回客户端
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整个Http Request处理结束