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System.Web.Handlers. TraceHandler System.Web.Handlers. WebAdminHandler
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Responsible for rendering the trace report when tracing is enabled at the application level. Renders an interface for administration of a web application. This handler actually redirects the request to the Web Admin application, passing along the name of the application where the request was made as a query string parameter. (see 5 for details on this tool). This admin tool then acts as an editor for the web.config of the requesting application. A handler for extracting resources from assemblies and returning them to clients. The resource is described using query string parameters. This handler can be used from the src attribute of a script or image element, and can also be used from a link element to return a Cascading Style Sheet. Used to compile all pages and code in an application after it has been deployed. This handler finds all pages in the site and types in the App_Code directory and proactively compiles them; this way users don t experience any lag when they request a page for the first time. Support for Web Part layouts for use in portal applications.
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System.Web.Handlers. PrecompHandler
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CHAPTER 2 THE ASP.NET REQUEST PIPELINE
Table 2-4. Continued
Http Handler Type
System.Web.UI. PageHandlerFactory
File Name/Extension
*.aspx
Description
The old tried and true. This handler is responsible for mapping the URL of the request for an ASPX page to the type that services the request. Provides a page directive infrastructure to simplify the mapping of a requested URL to a custom handler (see the Creating an Http Handler section that follows). This handler simply streams the file requested to the client. It s what IIS would do by default. The advantage to this handler is that requests for static content (HTM, JPG, GIF, and so forth) can be mapped to the Framework; therefore, requests for these files go through the entire Http pipeline. This strategy can be used to secure static content when using Forms-based security. The Web Services handler. Depending on the request type and URL, this handler generates the testing interface, generates Web Services Description Language (WSDL) documents, and takes Simple Object Access Protocol (SOAP) messages off the wire and invokes the appropriate method on an instance of the type described in the request. The remoting handler. Takes SOAP or binary streams off the wire, invokes the method, and serializes the .NET type back to the caller. This handler simply returns an HTTP status of 403, causing a Forbidden file type extension to be raised on the client. It s a simple way to secure files of certain types on the server. Do you have an XML architecture where all eXtensible Stylesheet Language Transformation (XSLT) is done on the server Map *.xml to this handler and no one can pull down the raw XML that lives on your server.
System.Web.UI. SimpleHandlerFactory
*.ashx
System.Web. StaticFileHandler
Any (you choose)
System.Web.Services.Protocols. WebServiceHandlerFactory
*.asmx
System.Runtime.Remoting. Channels.Http.HttpRemoting HandlerFactory System.Web.HttpForbiddenHandler
*.rem *.soap
Dozens of extensions, including ASCX, VB, CS, and others
As you can tell from Table 2-4, the Page handler is really just the tip of the iceberg of functionality that ships with the Framework and is implemented as an HTTP handler. Next we ll take a look at how you can further extend the pipeline by creating your own handlers.
CHAPTER 2 THE ASP.NET REQUEST PIPELINE
Creating an Http Handler
It s possible to create a type that implements the IHttpHandler interface and have it respond to any pattern of URL. The advantage is you have full control over the URL, and the URL of the request doesn t need to correspond to a physical file. The downside is that IIS configuration is required to map the URL into the framework, and ASP .NET configuration is required to map the URL to your specific handler. The alternative is to use the built-in, simple handler factory. This handler is mapped to files with an ASHX extension. The WebHandler directive is used to point an ASHX page at a type that implements the IHttpHandler interface. Visual Studio adds a file with this directive to your project via the Generic Handler option in the Add New Item dialog window.
Figure 2-13. The simple handler project item in the Add New Item dialog window The code template included for this file is a complete implementation of a handler, albeit not a very dramatic one. This code gets an image from the database and returns it as a binary stream. It also caches the images for 60 seconds, instead of going to the database for them on each request. <%@ WebHandler Language="C#" Class="MyHandler" %> using using using using using using System; System.Web; System.Web.Caching; System.Configuration; System.Data; System.Data.SqlClient;
public class MyHandler : IHttpHandler {
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