ASPNET Application Lifecycle in .NET framework

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ASPNET Application Lifecycle
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The application lifecycle that ASPNET 20 goes through when processing a request consists of quite of few layers As you can see in Figure 83, the ow of a request from a client starts with the request coming into IIS and logic being applied to determine whether the ASPNET runtime will be processing the request If the le extension of the request ends with aspx, ascx, ashx, asmx, or svc, the ASPNET 20 runtime handles the request, and the Application Manager creates an application domain for the request This application domain is used to provide isolation between the various web applications in IIS and allows each web application to be managed separately The byproduct of creating an application domain is the creation of the HTTP runtime, which consists of the HttpContext, HttpRequest,
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A SPNET AJA X 20 Extensions Communication Archite cture HttpResponse, and HttpApplication objects that work together to process
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the request The HttpContext class contains objects speci c to the current application request, such as the HttpRequest and HttpResponse objects The HttpRequest object contains information about the current request, including cookies and browser information The HttpResponse object contains the response sent to the client, including all rendered output and cookies It is the HttpApplication pipeline contained in the HttpApplication object that is of most interest to us, because the pipeline is responsible for the instantiation of the HTTP handlers and modules for the ASPNET 20 AJAX Extensions framework
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Request IIS
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Application Domain HTTP Runtime HTTP Request HTTP Response
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HTTP Application Pipeline
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Response
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Figure 83 ASPNET application lifecycle
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More Information about HTTP Handlers and Modules
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For a more detailed explanation about HTTP handlers and modules that are discussed in the next sections, see Appendix C, ASPNET Handlers and Modules
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8: A SPNET AJA X Communication Archite cture HTTP Handlers
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In their simplest form, HTTP handlers run in response to a request into an ASPNET application and are part of the HttpApplication pipeline illustrated in Figure 83 In the course of processing the request, the HttpApplication pipeline loads the speci c handler based on the le extension of the request and uses it to process the request It is during this processing that the ASPNET 20 AJAX Extensions handlers provide added functionality to the request, providing support for handling REST-based web services, application services, and script resource requests
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ScriptHandlerFactory
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The ScriptHandlerFactory is designed to handle the entire suite of RESTbased service requests for the authentication service, pro le service, and role service It also provides support for working with the older ASMXstyle REST web services The handler is designed to handle requests with le extensions consisting of the *_ApplicationServiceaxd or *asmx wildcard pattern, which are for the application services and ASXM-style web services, respectively In the course of processing, the handler looks for two conditions to determine whether the request is something it can handle:
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1 Is the header content type application/json 2 Does the path end with /js or /jsdebug
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If the content type is application/json, the handler calls either the internal application service or the ASMX service to process the request If the handler encounters le extensions that meet the *asmx pattern and also end with /js or /jsdebug, it generates the JavaScript proxy class for the web service Services that are registered with the ScriptManager and select the InlineScript=false option rely on this feature to process requests for JavaScript proxy classes from the client
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ScriptResourceHandler
The ScriptResourceHandler is used by ASPNET 20 AJAX Extensions to process requests for script resources that contain the ScriptResourceaxd lename Scripts that are embedded assembly resources and are registered with the ScriptManager rely on this handler to get loaded onto the page
A SPNET AJA X 20 Extensions Communication Archite cture
In fact, this is how the framework JavaScript les MicrosoftAjaxjs, MicrosoftAjaxWebFormsjs, and MicrosoftAjaxTimerjs are delivered to the client How the requests are formatted and how the handler processes the requests is interesting If you look at the source of your pages, you will see a script reference like the one in Listing 818 that the handler is designed to work with As the handler processes the request, it rst decrypts the d parameter, which contains information such as whether the script le should be GZip compressed, the name of the assembly that contains the embedded JavaScript resource, and whether the handler should add a call to SysApplication notifyScriptLoaded at the end of the script block to notify the application that the script has been loaded The handler then uses this information to create an instance of the type that contains the script resource, composes the output, compresses the output if needed, and then returns the nal result to the client