HttpClientExtensions.cs

    public static class HttpClientExtensions
    {
        public static T Get<T>(this HttpClient client, string url)
        {
            var response = client.GetAsync(url).Result;
            var content = response.Content.ReadAsStringAsync().Result;
            return JsonConvert.DeserializeObject<T>(content);
        }

        public static HttpResponseMessage PostAsJson(this HttpClient client, string url)
        {
            return client.PostAsJson(url, new { });
        }

        public static HttpResponseMessage PostAsJson(this HttpClient client, string url, object model)
        {
            return client.PostAsync(url, new StringContent(JsonConvert.SerializeObject(model), Encoding.UTF8, "application/json")).Result;
        }
    }