HttpApplication processing pipeline 19 events.

The HttpApplication object was created by ASP., which is an important object in ASP. NET to process the request. To facilitate extensibility, HttpApplication is handled in a way that handles pipelines, dividing the steps of processing into multiple steps, each of which is exposed to the programmer in the form of events, which are triggered sequentially in a fixed order of processing. Programmers can define a request extension process by writing an event-handling method.

For HttpApplication, to ASP. 4.0, 19 standard events are provided.

1.beginrequest:asp.net begins processing the first event of the request, indicating the start of processing.

2.AuthenticateRequest: Authentication request, generally used to obtain the requested user information.

3.PostAuthenticateRequest: The requested user information has been obtained.

4.AuthorizeRequest: Authorization, generally used to check whether a user's request is granted permission.

5.PostAuthorizeRequest: User request has been granted.

6.ResolveRequestCache: Gets the processing results of the previous processing cache, if previously cached, then no more processing of the request, directly return the cached results.

7.PostResolveRequestCache: The processing of the cache has been completed.

8.PostMapRequestHandler: The requested processor object has been created based on the user's request.

9.AcquireRequestState: The status of the request, generally used in the session

10.PostAcquireRequestState: The session has been obtained

11.PreRequestHandlerExecute: Prepare the handler for execution.

12.PostRequestHandlerExecute: The handler has been executed

13.ReleaseRequestState: The status of the release request.

14.PostReleaseRequestState: The status of the request has been released.

15.UpdateRequestCache: Update the cache.

16.PostUpdateRequestCache: The cache has been updated.

17.LogRequest: Requested log operation

18.PostLogRequest: The requested log operation has been completed.

19.EndRequest: This request processing is completed.

The

HttpApplication handles 19 events for a pipeline.