public void SelectsSuperItemBasedOnParameter_5LMT() { // arrange var configuration = new HttpConfiguration(); configuration.Services.Replace(typeof(IHttpActionSelector), new MediaTypeBasedActionSelector()); configuration.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } ); configuration.AddFiveLevelsOfMediaType(); var server = new InMemoryServer(configuration); var client = new HttpClient(server); var request = new HttpRequestMessage(HttpMethod.Get, "http://lhasa/api/Item/1"); var headerValue = new MediaTypeWithQualityHeaderValue("application/json"); headerValue.Parameters.Add(new NameValueHeaderValue("domain-model", "SuperItem")); request.Headers.Accept.Add(headerValue); // act var response = client.SendAsync(request).Result; var content = response.Content.ReadAsStringAsync().Result; var mediaType = response.Content.Headers.ContentType.ExtractFiveLevelsOfMediaType(); // assert Assert.Equal("SuperItem", mediaType.DomainModel); }