I download the simple,and run Example project,First client request and response "Bad mac"

[rustbomber]

var clientHandler = new HawkClientMessageHandler(new HttpClientHandler(), credential, "some-app-data");
var client = new HttpClient(clientHandler);

            var request = new HttpRequestMessage(HttpMethod.Get, "http://localhost:8091/api/HelloWorld");
            request.Headers.Host = "localhost";

            var response = client.SendAsync(request).Result;
            string message = response.Content.ReadAsStringAsync().Result;
            Console.WriteLine("Response {0} - Http Status Code {1}", message, response.StatusCode);

Additional:
I change url to http://localhost:28290/api/HelloWorld and run Example.Web project,is work well.

[rustbomber]

I catch the info:
HawkNet Information: 0 : Normalized String: hawk.1.header
1403852658
1Vd0CA
GET
/api/HelloWorld
localhost
8091

---

HawkNet Information: 0 : Normalized String: hawk.1.header
1403852658
1Vd0CA
GET
/api/HelloWorld
localhost
80

I found the port is difference,why?