JSON Request with HttpClient

gistfile1.txt

var operationUrl = string.Format("{0}/repos/{1}/{2}/commits/{3}/comments", GitHubClientApiUrl, this.repoOwner, this.repoName, commitId);
            var jsonBody = JsonConvert.SerializeObject(new { body = message });

            using (var httpClient = new HttpClient())
            {               
                httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Token", ConfigurationManager.AppSettings["GitHubApiAccessToken"]);
                httpClient.DefaultRequestHeaders.Add("User-Agent", UserAgent);
                httpClient.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

                return await httpClient.PostAsync(new Uri(operationUrl), new StringContent(jsonBody));
            }