HttpHandler For 404 Error Stopped Working After 4.0 Upgrade?
Feb 15, 2011
I have an HttpHandler which takes care of 404 errors, which I implemented years ago as a way of doing url routing. If the request maps to a valid page, it redirects to that page. Otherwise, it returns a 404. (I know I should start using the new routing feature of asp.net 4.0, but that will take some time. I need to get this working asap.)
In IIS6, I have mapped the 404 error to "/404.ashx". In the web.config, custom errors are set up like so:
<customErrors mode="On" defaultRedirect="error.aspx">
<error statusCode="404" redirect="/404.ashx"/>
</customErrors>
and the http handler:
<httpHandlers>
<add verb="GET" path="404.ashx" type="myNamespace.PageNotFoundHandler,myAssemblyName"/>
</httpHandlers>
This has been working for years - it stopped working as soon as I changed the site to use asp.net 4.0. Everything was recompiled for 4.0, and there were no code changes.
Now, when I hit one of these urls that used to work, I get a blank page with a 404 error code. If I remove the IIS 404 error mapping, I get a regular old 404 page. It seems that the httphandler is not being called.
I have other http handler which are working fine. I figure there must be some configuration setting I missed or something like that. Naturally, this is a problem only on my production server, so I can't run it in the debugger to see what is happening.
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