Edited Issue: HttpResponseException thrown at ActionFilter is being intercepted at ExceptionFilter [868]

From here: http://stackoverflow.com/questions/15065594/error-handling-in-web-api-self-hosted-server-for-actionfilterattribute

As user mentions, when throwing HttpResponseException at the controller's action, exception filter is not executed...but throwing at an action filter is causing the exception filter to be executed.

I was able to repro this issue.

Following is repro code:
```
using System;
using System.Configuration;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Web.Http.Filters;
using System.Web.Http.SelfHost;

namespace Service
{
class Service
{
private static HttpSelfHostServer server = null;
private static AppSettingsReader appSettingsReader = null;

static void Main(string[] args)
{
appSettingsReader = new AppSettingsReader();

string baseAddress = string.Format("http://{0}:9095/", Environment.MachineName);

HttpSelfHostConfiguration config = new HttpSelfHostConfiguration(baseAddress);
config.Routes.MapHttpRoute("Default", "api/{controller}/{id}", new { id = RouteParameter.Optional });
config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always;

try
{
server = new HttpSelfHostServer(config);
server.OpenAsync().Wait();

Console.WriteLine("Service listenting at: {0} ...", baseAddress);
Console.ReadLine();
}
catch (Exception ex)
{
Console.WriteLine("Exception Details:\n{0}", ex.ToString());
}
finally
{
if (server != null)
{
server.CloseAsync().Wait();
}
}
}
}

public class SampleController : ApiController
{
[TestActionFilter]
[TestExceptionFilter]
public string Get()
{
//throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.BadRequest, "bad data"));

return "Hello";
}

public string Post([FromBody] string input)
{
return input;
}
}

public class TestActionFilterAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)
{
throw new HttpResponseException(actionContext.Request.CreateResponse(HttpStatusCode.BadRequest, "bad data"));
}
}

public class TestExceptionFilterAttribute : ExceptionFilterAttribute
{
public override void OnException(HttpActionExecutedContext actionExecutedContext)
{
Console.WriteLine("Exception type" + actionExecutedContext.Exception.GetType().ToString());
}
}
}
```