WebApi2 Attribute Routing 404

Question

I upgraded an existing MVC4/WebAPI1 project to MVC5/WebAPI2 in Visual Studio 2012 as described here. The site worked as expected. I then followed the directions for attribute based routing found here - except I keep getting a 404 for the controllers. My steps were:

• Add config.MapHttpAttributeRoutes(); in WebApiConfig.Register
• Add config.EnsureInitialized(); in WebApiConfig.Register
• Add AttributeRouting (ASP.NET WebAPI) from NuGet
• Add the Route attribute on my test controller

I see that the test route is getting registered when I put a break after config.EnsureInitialized(). However, trying to hit that route gives me a 404.

If there any way out of the box to inspect the request and see how the routing table is being matched?

Answer 1

You can use Route Debugger to inspect all Routes. There's an official post from MSDN that covers this:

• Debugging ASP.NET Web API with Route Debugger

Answer 2

I had the almost the same issues. And cannot find any working solution. The Route debugger is really doesn't work with Web API 2. Finally, I've found a working way to debug Web API 2 including Route Attributes.

Microsoft.AspNet.WebApi.HelpPage

Нope this helps someone save a few hours of debuging.