ExceptionFilters in WebAPI never get hit

I’m trying to catch errors coming from one of my controllers. Elmah is not catching them so in trying to find out why, I reduced the problem to the simplest form which excludes Elmah.

[HttpGet]
[Route("foo")]
public HttpResponseMessage Foo() 
{
    throw new Exception("test");
}


protected void Application_Start()
{
    GlobalConfiguration.Configuration.Filters.Add(new UnhandledExceptionFilter());
    GlobalConfiguration.Configure(WebApiConfig.Register);

public class UnhandledExceptionFilter : ExceptionFilterAttribute
{
    public override void OnException(HttpActionExecutedContext context) {
        dosomething(); //It never reaches here

Note: a proper JSON error is emitted to the client.

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Method 1

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Method 1

Instead of doing GlobalConfiguration.Configuration.Filters.Add, go to the Register method in the WebApiConfig class and do config.Filters.Add(new ...()); instead, that works for me.

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