asp.net data matrix THE ASP.NET REQUEST PIPELINE in Visual C#.NET

Maker Data Matrix in Visual C#.NET THE ASP.NET REQUEST PIPELINE

CHAPTER 2 THE ASP.NET REQUEST PIPELINE
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Table 2-2. Summary of Events that Occur in the HTTP Request Processing Pipeline
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BeginRequest PreAuthenticateRequest AuthenticateRequest PostAuthenticateRequest PreAuthorizeRequest AuthorizeRequest PostAuthorizeRequest PreResolveRequestCache ResolveRequestCache PostResolveRequestCache PreMapRequestHandler PostMapRequestHandler PreAcquireRequestState AcquireRequestState PostAcquireRequestState PreRequestHandlerExecute Page handler Fired PostRequestHandlerExecute
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First event in pipeline. Leveraged for authentication by Forms-based, Windows-based, and Passport authentication. Used for authorization by the ASP.NET Role Manager. Also taken advantage of by file authorization and URL authorization modules. Used by the Output Cache module.
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New events to exert programmatic influence over the handler to be used for the request. Session state restored for persistence (memory, state server, or SQL Server). Last event before and after execution of actual handler for request. After PreRequestHandlerExecute is finished, the ProcessRequest method of the handler is called. This is where the real nuts and bolts of the request processing actually occurs. Session state returned to persistence.
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PreReleaseRequestState ReleaseRequestState PostReleaseRequestState PreUpdateRequestCache UpdateRequestCache PostUpdateRequestCache EndRequest PreSendRequestHeaders PreSendRequestContent
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Used by the Output Cache module for moving return value of handler into the web server or client cache. Last chance to affect the output stream before it s sent back to IIS. Headers streamed out, and then content streamed out.
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After the context of the request is established, the BeginRequest event is fired. Any Session variables that exist are not yet available, but Request and Response, having been established as part of the context, can be examined and exercised. You can check details of the request, such as the protocol the request came in on (Http or Https), details of the URL such as the file type being requested, or incoming cookies. BeginRequest is the first opportunity you have to extend the processing done in the pipeline. Afterward the security events, AuthenticateRequest and AuthorizeRequest, fire. These are the events that the ASP .NET programmers catch to implement the security models that ship with the Framework. For example, when the AuthenticateRequest fires and Formsbased authorization is set up in the web.config, a check is made to see if the authorization ticket cookie is part of the request. If it s not, the request is redirected to the URL specified in the configuration file for Forms-based authentication. In the authorization event, the users roles are checked against their allowed roles and the resource they re attempting to access (see 5 for details of these features).
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CHAPTER 2 THE ASP.NET REQUEST PIPELINE
The number of events in the lifetime of the HttpApplication object has significantly increased for ASP .NET 2.0. This is because for many events, a Pre and a Post event has been added to the pipeline. At first glance it may seem odd to have an event occur after the original event occurs. For example, AuthenticateRequest fires after the Framework has completed an authentication check. So what do you need PostAuthenticateRequest for The answer to that lies in environments where many traps may be set up for the AuthenticateRequest event. In these environments, you can ensure your event fires after all other processing has occurred by trapping the PostAuthenticateRequest event. The other consideration is backwards compatibility. The ASP .NET team couldn t just replace all of the events with a Pre and Post event pair, because that would break all existing global.asax files and HttpModule implementations. In any case, the flexibility developers have at their disposal has increased dramatically. Most events in the pipeline now have a sister event that occurs before any processing has been done for this step in the pipeline (the Pre event), and another that occurs after all processing is complete (the Post event). The built-in Role Manager, a feature new to ASP .NET 2.0, uses the PreAuthorizeRequest event as its entry point for processing. This is where the Role Manager checks to see if role management is on. If it is, the manager checks to see if a user object exists; and if it s not, the manager creates a generic user. This is also where the roles cookie is managed. (We ll examine the Role Manager specifically in 5.) Next up after the security events is ResolveRequestCache. Pre and Post events have been added for this event as well. In ASP .NET 1.x, this event is the last chance for you to extend the pipeline before an instance of the HttpHandler is created for the request. With the addition of the Pre and Post MapRequestHandler events (below), this is no longer the case, and this event is now properly the domain of the request cache. This is the entry point for the Cache module. The Cache module is the extension to the runtime that manages sending and retrieving pages from the cache. You may already be familiar with the OutputCache directive. <%@ OutputCache duration="5" VaryByParam="*" %>
After the first time the page is requested, the actual markup produced during page processing is put into the Output Cache. In this event trap, the ASP .NET runtime examines the details of the request, and sees if there s a corresponding entry in the cache. When it finds a matching entry, the runtime retrieves that pregenerated HTML from the cache, and sends it down the output stream. An instance of the Page object that would normally handle the request is never even created. This can improve the performance of your application by many orders of magnitude. Output caching can be declared at the UserControl level as well, allowing you to cache static portions of your page, while dynamically generating the parts that are unique across users and requests. The VaryByParam attribute, when used with the value of *, results in a different entry in the cache for each unique value carried in the URL as a query string, and for each different form value in an HTTP Post. This powerful facility can be used to cache each unique version of a page, even if its content is dynamically generated based on input variables such as these. While output caching is highly recommended, as it can vastly improve the performance of your site, this event is not a common one to trap and extend the pipeline with.
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