I have implemented WebAPI in my EPiServer solution. I am having trouble with error handling. I would like my errors to return as some JSON along with the correct status code. No matter what I do, error sare returning an HTML error page. I have gon through a whole bunch of different options. This is what I think I need to do:

[HttpGet]
public HttpResponseMessage GetViewpoint(int id)
{
	var version = WebConfigurationManager.AppSettings["ApiVersion"];
	if (id == 99)
	{
		var error = new WebApiError("This id is BAD BAD BAD!");
		var apiErrorModel = new WebApiModel(HttpStatusCode.BadRequest, error) {Version = version};

		return this.Request.CreateResponse(apiErrorModel.StatusCode, apiErrorModel,
			new System.Net.Http.Headers.MediaTypeHeaderValue("application/json"));
	}

	dynamic jObject = new JObject();
	jObject["Message"] = "This is a viewpoint";
	var apiModel = new WebApiModel("Success", jObject, HttpStatusCode.OK, version);

	return this.Request.CreateResponse(apiModel.StatusCode, apiModel);
}

But this still returns an HTML error page: