Maximizing ASP.NET Real World, Object-Oriented Development [Electronic resources] نسخه متنی

The Built-in Handlers

You've been dealing with HttpHandlers all along, even if you didn't realize it. In Chapter 6, "The Nuts and Bolts of IIS and Web Applications," we explained that a number of different file extensions are mapped in the IIS control panel to be handled by ASP.NET. What the control panel doesn't show is how ASP.NET deals with the requests that land in its lap. To understand that, we'll have to take a look at the machine.config file, normally located in the C:\WINDOWS\Microsoft.NET\Framework\v2.0.xxxx\CONFIG folder.

You're probably already familiar with the web.config file found in your applications, which sets up the configuration for the application. The machine.config file can store much of the same configuration data, except that it applies to the entire machine.

Listing 8.1. The httpHandlers section of machine.config

<httpHandlers>
<clear />
<add verb="*" path="trace.axd" type="System.Web.Handlers.TraceHandler" />
<add verb="GET" path="WebAdmin.axd" type="System.Web.Handlers.WebAdminHandler" />
<add verb="GET" path="WebResource.axd" type="System.Web.Handlers
.AssemblyResourceLoader" />
<add verb="GET" path="CachedImageService.axd" type="System.Web.UI.Imaging
.CachedImageServiceHandler" />
<add verb="GET" path="counters.axd" type="System.Web.Handlers.SiteCountersHandler" />
<add verb="GET" path="precompile.axd" type="System.Web.Handlers.PrecompHandler" />
<add verb="GET" path="WebPartExport.axd" type="System.Web.Handlers
.WebPartExportHandler" />
<add verb="*" path="*.aspx" type="System.Web.UI.PageHandlerFactory" />
<add verb="*" path="*.ashx" type="System.Web.UI.SimpleHandlerFactory" />
<add verb="*" path="*.asix" type="System.Web.UI.ImageGeneratorFactory" />
<add verb="*" path="*.asmx" type="System.Web.Services.Protocols
.WebServiceHandlerFactory, System.Web.Services, Version=2.0.3600.0, Culture=neutral,
 PublicKeyToken=b03f5f7f11d50a3a" validate="false" />
<add verb="*" path="*.rem" type="System.Runtime.Remoting.Channels.Http
.HttpRemotingHandlerFactory, System.Runtime.Remoting, Version=2.0.3600.0, Culture=neutral,
 PublicKeyToken=b77a5c561934e089" validate="false" />
<add verb="*" path="*.soap" type="System.Runtime.Remoting.Channels.Http
.HttpRemotingHandlerFactory, System.Runtime.Remoting, Version=2.0.3600.0, Culture=neutral,
 PublicKeyToken=b77a5c561934e089" validate="false" />
<add verb="*" path="*.asax" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.ascx" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.master" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.skin" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.browser" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.sitemap" type="System.Web.HttpForbiddenHandler" />
<add verb="GET,HEAD" path="*.dll.config" type="System.Web.StaticFileHandler" />
<add verb="GET,HEAD" path="*.exe.config" type="System.Web.StaticFileHandler" />
<add verb="*" path="*.config" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.cs" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.csproj" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.vb" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.vbproj" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.webinfo" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.licx" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.resx" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.resources" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.mdb" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.vjsproj" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.java" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.jsl" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.ldb" type="System.Web.HttpForbiddenHandler" />
<add verb="*" path="*.mdw" type="System.Web.HttpForbiddenHandler" />
<add verb="GET,HEAD,POST" path="*" type="System.Web.DefaultHttpHandler" />
<add verb="*" path="*" type="System.Web.HttpMethodNotAllowedHandler" />
</httpHandlers>