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Response
HttpResponse
Server
HttpServerUtility
Session
HttpSessionState
CHAPTER 2 THE ASP.NET REQUEST PIPELINE
Most of the process of establishing the HttpContext is just a matter of de-serializing request details as they come in off the wire. The Request object s QueryString collection is nothing more than a convenient way to get to details about the URL of the request. The ServerVariables and Cookies collections are a programmatic convenience that saves you from manually parsing the raw HTTP text of the request. Other parts of the context, such as Session and Cache, are restored from the memory space of the worker process. The ViewState, if present, is restored from the hidden input whose value was posted as part of the request. All HttpContext properties are available throughout the processing of the request. There s even an Item method that acts as a state bag (like Session, Cache, and Application), so you can pass your own information along through the pipeline. You can use this to pass information from a preprocessor into a Page handler. You ll see an example of this as we move through our examination of HttpApplication. You can also acquire a reference to the context from any assembly, as long as it has a reference to the System.Web assembly. The HttpContext type has a static member named Current, which returns a reference to an HttpContext instance. In this code, a property named CurrentWebAppFilter of type WebAppFilter is exposed. This is a custom type created for this sample application that exposes properties any page can use to establish a user context. The instance is stored in the Session, but no pages need be aware of this, as they just use this static property to get to it. Because it s in a shared assembly, the reference to the Context must be programmatically established. This is how the helper class gets to the Session: public static WebAppFilter CurrentWebAppFilter { get { HttpContext Context = HttpContext.Current; if (Context.Session["WebAppFilter"] == null) Context.Session["WebAppFilter"] = new WebAppFilter(); return (WebAppFilter)Context.Session["WebAppFilter"]; } set { HttpContext Context = HttpContext.Current; Context.Session["WebAppFilter"] = value; } } Also keep in mind that this assembly has a reference to the System.Web.dll assembly, and has a using System.Web statement at the top of the code file. You ll need both to resolve the references to the HttpContext type. HttpApplication is perhaps the most important type in the ASP .NET Framework. It runs the show. It receives the request from IIS, creates the HttpContext, and creates the instance of the handler the request is for. Before it hands the request off to the handler, it authenticates the request, checks the output cache to see if the response has been previously cached, and deals with gathering the response generated by the handler and sending that back to IIS. The entire pipeline looks something like Figure 2-1.
CHAPTER 2 THE ASP.NET REQUEST PIPELINE
Figure 2-1. The ASP .NET request processing pipeline In the next section we ll take a closer look at the specific events that fire throughout this pipeline. These events are important because extensions to this pipeline are how many ASP.NET features have been implemented. They include Forms-based authentication and HTTP output caching. Many features of the ASP .NET Framework that allow you to use IIS as a host for different types of requests are implemented as HttpHandlers. These include not only Web Form requests, but also requests for Web Services and requests for Remoted or Serviced components.
The HttpApplication Life Cycle
The HttpApplication type raises a number of events as the request moves through the pipeline (see Table 2-2). We ll take a look at a couple of strategies for trapping these events and extending the pipeline a bit later. First, let s examine these events and the order they fire in. Remember that these events fire with every request that s handled by the Framework, so don t do anything really computationally intense, or you ll create a hotspot and impair the application s performance.
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