utilize HttpClient to generate a SSL access and generate REST access to fetch data

WebRequestHandler handler = new WebRequestHandler();
                try
                {
                    X509Certificate2 certificate = new X509Certificate2(System.IO.File.ReadAllBytes(ConfigurationManager.AppSettings["webapicertpath"]), ConfigurationManager.AppSettings["webapicertpwd"]); ;
                    handler.ClientCertificates.Add(certificate);
                    ServicePointManager.ServerCertificateValidationCallback =
                        (object sender, X509Certificate certificate1, X509Chain chain, SslPolicyErrors sslPolicyErrors) =>
                        {
                            return true;
                        };
                }
                catch
                {
                }
                httpClient = new HttpClient(handler);

　　to fetch data with REST httpclient, just utilize code below:

                case "get":
                    result = httpClient.GetAsync(url).Result.Content.ReadAsStringAsync().Result;
                    break;
                case "post":
                    result = httpClient.PostAsync(url, content).Result.Content.ReadAsStringAsync().Result;
                    break;
                case "put":
                    result = httpClient.PutAsync(url, content).Result.Content.ReadAsStringAsync().Result;
                    break;
                case "delete":
                    result = httpClient.DeleteAsync(url).Result.Content.ReadAsStringAsync().Result;
                    break;
                default:
                    break;

utilize HttpClient to generate a SSL access and generate REST access to fetch data

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