C: A SPNET Handlers and Module s in Visual Studio .NET

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Appendix C: A SPNET Handlers and Module s
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Listing C3 HTTP Handler Factory
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namespace SimpleFactory { public class MyHandlerFactory : IHttpHandlerFactory { #region IHttpHandlerFactory Members public IHttpHandler GetHandler(HttpContext context, string requestType, string url, string pathTranslated) { switch (requestType) { case "POST": return new PostHandler(); break; case "GET": return new GetHandler(); break; } return null; } public void ReleaseHandler(IHttpHandler handler) { //not implemented } #endregion } }
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The second part to working with the factory handler is the same as handlers and relates to registration in the webcon g le of your application Factories, just like handlers, can be con gured to respond to speci c HTTP verbs such as POST and GET, and a speci c path that can represented by a speci c URL or by using wildcard strings such as *axd In Listing C4, we show a factory being added to the HttpHandlers section of a webcon g le with a verb of *, which means all, a path of MyFactoryaxd, and nally a type of SimpleFactoryMyFactory, which is the name of the class including the namespace
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HTTP Module s
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Listing C4 HTTP Handler Factory Registration
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<systemweb> <httpHandlers> <add verb="*" path="MyFactoryaxd" type="SimpleFactoryMyHandlerFactory"/> </httpHandlers> </systemweb>
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HTTP Modules
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An HTTP module is similar in concept to the HTTP handler in the sense that it runs in response to a request into an ASPNET application In the case of a module, however, it runs with every request regardless of the HTTP verb or the path of the URL The HTTP module works with the Http Application pipeline as it goes through the various events that occur during processing, providing extensibility points as events occur, much like an event handler
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Overview of HTTP Modules An HTTP module is a managed class that implements the IHttpModule interface An HTTP module can preprocess and post-process a request by intercepting and handling system events and events raised by other modules The IHttpModule interface de nes two methods: Init and Dispose The Init method initializes the module and prepares it to handle requests It is during this method call that you subscribe to the events (see Table C1) that you want to work with, which in turn plugs the module into the ASPNET 20 request processing pipeline and enables the ASPNET 20 runtime to invoke the event handlers so that they can participate in the request processing The Dispose method of the module is where you clean up resources that the module uses
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Appendix C: A SPNET Handlers and Module s
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Table C1 HttpApplication Events Event BeginRequest Description
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Occurs as the rst event in the HTTP pipeline chain of execution when ASPNET responds to a request Occurs when a security module has established the identity of the user Occurs when a security module has established the identity of the user Occurs when a security module has veri ed user authorization Occurs when the user for the current request has been authorized Occurs when ASPNET completes an authorization event to let the caching modules serve requests from the cache, bypassing execution of the event handler (for example, a page or an XML web service) Occurs when ASPNET bypasses execution of the current event handler and allows a caching module to serve a request from the cache Occurs when ASPNET has mapped the current request to the appropriate event handler Occurs when ASPNET acquires the current state (for example, session state) that is associated with the current request Occurs when the request state (for example, session state) that is associated with the current request has been obtained Occurs just before ASPNET begins executing an event handler (for example, a page or an XML web service) example, a page or an XML web service) nishes execution
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AuthenticateRequest
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AuthorizeRequest
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ResolveRequestCache
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PostMapRequestHandler
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AcquireRequestState
PostAcquireRequestState
PreRequestHandlerExecute
PostRequestHandlerExecute Occurs when the ASPNET event handler (for
HTTP Module s
Event ReleaseRequestState
Description
Occurs after ASPNET nishes executing all request event handlers This event causes state modules to save the current state data Occurs when ASPNET has completed executing all request event handlers and the request state data has been stored Occurs when ASPNET nishes executing an event handler to let caching modules store responses that will be used to serve subsequent requests from the cache Occurs when ASPNET completes updating caching modules and storing responses that are used to serve subsequent requests from the cache Occurs as the last event in the HTTP pipeline chain of execution when ASPNET responds to a request