ASP.NET MVC - Catch All Route And Default Route

Question

In trying to get my application to produce 404 errors correctly, I have implemented a catch all route at the end of my route table, as shown below:

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Answer 1

Well, what I have found is that there is no good way to do this. I have set the redirectMode property of the customErrors to ResponseRewrite.

This gives me the sought after behavior, but does not display the formatted page.

To me this is poorly done, as far as SEO goes. However, I feel there is a solution that I am missing as SO does exactly what I want to happen. The URL remains on the failed page and throws a 404. Inspect stackoverflow.com/fail in Firebug.