generate qr code in c# HTTP Handlers, Modules, and Routing in Visual C#

Generator QR Code ISO/IEC18004 in Visual C# HTTP Handlers, Modules, and Routing

4 HTTP Handlers, Modules, and Routing
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So you ve learned that any incoming requests for ASP.NET resources are handed over to the worker process for the actual processing. The worker process is distinct from the Web server executable so that even if one ASP.NET application crashes, it doesn t bring down the whole server. On the way to the final HTTP handler, the request passes through a pipeline of special runtime modules HTTP modules. An HTTP module is a .NET Framework class that implements the IHttpModule interface. The HTTP modules that filter the raw data within the request are configured on a per-application basis within the web.config file. All ASP.NET applications, though, inherit a bunch of system HTTP modules configured in the global web.config file. Applications hosted under IIS 7.x integrated mode can configure HTTP modules that run at the IIS level for any requests that comes in, not just for ASP.NET-related resources. An HTTP module can pre-process and post-process a request, and it intercepts and handles system events as well as events raised by other modules.
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The IHttpModule Interface
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The IHttpModule interface defines only two methods: Init and Dispose. The Init method initializes a module and prepares it to handle requests. At this time, you subscribe to receive notifications for the events of interest. The Dispose method disposes of the resources (all but memory!) used by the module. Typical tasks you perform within the Dispose method are closing database connections or file handles. The IHttpModule methods have the following signatures:
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void Init(HttpApplication app); void Dispose();
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The Init method receives a reference to the HttpApplication object that is serving the request. You can use this reference to wire up to system events. The HttpApplication object also features a property named Context that provides access to the intrinsic properties of the ASP.NET application. In this way, you gain access to Response, Request, Session, and the like. Table 4-7 lists the events that HTTP modules can listen to and handle.
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Part I The ASP.NET Runtime Environment
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TABLE 4-7
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HttpApplication Events in Order of Appearance
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Description
Occurs as soon as the HTTP pipeline begins to process the request. Occurs when a security module has established the identity of the user. Occurs when a security module has verified user authorization. Occurs when the ASP.NET runtime resolves the request through the output cache. Occurs when the HTTP handler to serve the request has been found. It is fired only to applications running in classic mode or under IIS 6. Occurs when the handler that will actually serve the request acquires the state information associated with the request. Occurs just before the HTTP handler of choice begins to work. Occurs when the HTTP handler of choice finishes execution. The response text has been generated at this point. Occurs when the handler releases the state information associated with the current request. Occurs when the ASP.NET runtime stores the response of the current request in the output cache to be used to serve subsequent requests. Occurs when the ASP.NET runtime is ready to log the results of the request. Logging is guaranteed to execute even if errors occur. It is fired only to applications running under IIS 7 integrated mode. Occurs as the last event in the HTTP pipeline chain of execution.
Event
BeginRequest AuthenticateRequest, PostAuthenticateRequest AuthorizeRequest, PostAuthorizeRequest ResolveRequestCache, PostResolveRequestCache MapRequestHandler, PostMapRequestHandler AcquireRequestState, PostAcquireRequestState PreRequestHandlerExecute PostRequestHandlerExecute ReleaseRequestState, PostReleaseRequestState UpdateRequestCache, PostUpdateRequestCache LogRequest, PostLogRequest EndRequest
Another pair of events can occur during the request, but in a nondeterministic order. They are PreSendRequestHeaders and PreSendRequestContent. The PreSendRequestHeaders event informs the HttpApplication object in charge of the request that HTTP headers are about to be sent. The PreSendRequestContent event tells the HttpApplication object in charge of the request that the response body is about to be sent. Both these events normally fire after EndRequest, but not always. For example, if buffering is turned off, the event gets fired as soon as some content is going to be sent to the client. Speaking of nondeterministic application events, it must be said that a third nondeterministic event is, of course, Error. All these events are exposed by the HttpApplication object that an HTTP module receives as an argument to the Init method. You can write handlers for such events in the global.asax file of the application. You can also catch these events from within a custom HTTP module.
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