RestSharp Invalid URI: URI方案无效

我正试着让我的头围绕着windows phone 7的休息。我试图使用POST方法来提供一些数据到服务器，但当它到达客户端。执行异步行，它崩溃，错误"无效的URI: URI方案是无效的。"我错过了什么?

        var client = new RestSharp.RestClient("10.0.1.20:8085");
        var request = new RestSharp.RestRequest("/test", RestSharp.Method.POST);
        request.AddParameter("param1", "value1", RestSharp.ParameterType.GetOrPost);
        request.AddParameter("param2", "value2", RestSharp.ParameterType.GetOrPost);
        request.AddParameter("param3", "value3", RestSharp.ParameterType.GetOrPost);
        request.AddParameter("param4", "value4", RestSharp.ParameterType.GetOrPost);
        client.ExecuteAsync(request, (response) =>
        {
            var auth = response.Content;
        });

var client = new RestSharp.RestClient("http://10.0.1.20:8085");