FIX: You receive an "HTTP 404 Error" error message and the custom HTTP handler does not run again after you map Aspnet_asapi.dll to .* (829930)

MORE INFORMATION

Steps to reproduce the behavior

1. Create an HTTP handler. To do this, create a file that is named HandlerError.cs by using the source code that appears at the end of this section.
   
   For more information about how to create an HTTP handler, see the "References" section of this article.
2. Create a new Visual C# library project, and then add the file that you created in step 1 to this project.
3. Create a new C# ASP.NET Web Form application that is named test.
   
   Note You can make both this project and the project that you created in step 2 part of the same solution.
4. Add the handler that you created in step 1 to the Web.config file that was created as a part of the Web Form application that you created in step 3. To do this, add the following code to the Web.config file.

   <?xml version="1.0" encoding="utf-8" ?>
   <configuration>
        <system.web>
             <httpHandlers>
                  <add verb="*" path="*" type="test.HandlerError,test" />
                       </httpHandlers>
   .
   .
   .
   <system.web>

5. Use Microsoft Internet Information Services (IIS) Configuration Manager to map all the unknown file name extensions for the Web Form application that you created in step 3 to the Aspnet_isapi.dll file. To do this, follow these steps:
   1. At a command prompt, type inetmgr.exe, and then press ENTER to open IIS Configuration Manager.
   2. Locate and then click the application that you created in step 3.
   3. Right-click the application, and then click Properties.
   4. In the Properties dialog box, click the Virtual Directory tab.
   5. On the Virtual Directory tab, click Configuration.
   6. In the Configuration dialog box, click the Mappings tab.
   7. On the Mappings tab, click Add.
   8. In the Executable text box, type the path of the Aspnet_isapi.dll file. For example, type the following:

      C:\WINDOWS\Microsoft.NET\Framework\v1.0.3705\aspnet_isapi.dll

   9. In the Extension text box, type the following, depending on your operating system:
      • Type .* if your computer runs Microsoft Windows XP.
      • Type * if your computer runs Microsoft Windows 2000.
   10. Click to clear the Check that file exists check box.
   11. In all open dialog boxes, click OK until you return to the main IIS Configuration Manager window, and then quit IIS Configuration Manager.
6. In your browser, open a default file in a subfolder that does not exist under the virtual directory that was created as a part of the Web Form application that you created in step 3. For example, type the following in the address bar and then press ENTER:

   http://localhost/test/folder

   You receive the following response from the handler:

   Handler Entered:

7. In your browser, open the following file:

   http://localhost/test/folder/file.aspx

   You receive an "HTTP 404 Error" error message.
8. In your browser, open the following file again, and then reload the page:

   http://localhost/test/folder

   You receive an "HTTP 404 Error" error message instead of the response from the handler that you received in step 6.

Code for HandlerError.cs

using System;
using System.Web;

namespace test
{

        public class HandlerError: IHttpHandler
        {


                bool IHttpHandler.IsReusable
                {
                        get {return false;}
                }

                public HandlerError()
                {
                        //
                        // TODO: Add constructor logic here.
                        //
                }


                void IHttpHandler.ProcessRequest(HttpContext context)
                {
                        context.Response.Write("Handler Entered:");
                }
        }
}