First let me say that I am very impressed with the Web Api and it's extensibility. I've managed to create the RESTful API prototype we've been itching to develop in a rather short amount of time.
Everything has been pretty straight forward as far as MediaTypeFormatters, DelegatingChannels, etc...
Now I'm trying to clean some things up, as far as 404s and 500s are concerned.
Is there a way to create some kind of default route or something so if a valid endpoint is "http://domain/Invoice" and they contact "http://domain/Invoices" I can return some custom page.
<error statusCode="404" redirect="/notfound.htm"/>
Or even better, return some custom object or message that run through the Formatters to return some JSON or XML?