在后端C#中 call web api

 　　　　　　　　//server-side online oauth2
                var sessionResult = (Opportunity)Session["OpportunityData"];
                var httpUrl = resourceUrl + "api/data/v9.1/accounts?$filter=accountid%20eq%20" + "hello world";
                AuthenticationContext authContext = new AuthenticationContext("https://login.windows.net/common", false);
                AuthenticationResult result = authContext.AcquireToken(resourceUrl, clientId, new UserCredential(account, password));
                using (HttpClient httpClient = new HttpClient())
                {
                    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
                    httpClient.Timeout = new TimeSpan(0, 2, 0);  // 2 minutes  
                    httpClient.DefaultRequestHeaders.Authorization =
                    new AuthenticationHeaderValue("Bearer", result.AccessToken);
                    httpClient.DefaultRequestHeaders.Add("OData-MaxVersion", "4.0");
                    httpClient.DefaultRequestHeaders.Add("OData-Version", "4.0");
                    HttpResponseMessage response = httpClient.GetAsync(httpUrl).Result;
                    var returnvalue = response.Content.ReadAsStringAsync().Result;
                    LogHelper.WriteLog("Return value:");
                    LogHelper.WriteLog(returnvalue);
                    JObject jo = JsonConvert.DeserializeObject<JObject>(returnvalue);
                    JArray ja = JsonConvert.DeserializeObject<JArray>(jo["value"].ToString());
　　　　　　　　　　}

                var weburi = resourceUrl + "api/data/v9.1/accounts";
                AuthenticationContext authContext = new AuthenticationContext("https://login.windows.net/common", false);
                AuthenticationResult result = authContext.AcquireToken(resourceUrl, clientId, new UserCredential(account, password));
                HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(weburi);

                req.Method = "post";
                req.Accept = "application/json";
                req.ContentType = "application/json; charset=utf-8";
                req.Headers.Add("OData-MaxVersion", "4.0");
                req.Headers.Add("OData-Version", "4.0");
                req.Headers.Add("If-Match","*");
                req.Headers.Set("Authorization", "Bearer " + result.AccessToken);
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

                var newSurveyResult = new JObject();
                newSurveyResult.Add("booleanvalue", true);
                newSurveyResult.Add("stringvalue", "Hello World!");byte[] data = Encoding.UTF8.GetBytes(newSurveyResult.ToString());
                Stream newStream = req.GetRequestStream();
                newStream.Write(data, 0, data.Length);
                newStream.Close();
                using (HttpWebResponse res = (HttpWebResponse)req.GetResponse())
                {
                    //StreamReader read = new StreamReader(res.GetResponseStream());
                    string head = res.Headers.ToString();
                }

                var weburi = resourceUrl + "api/data/v9.1/accounts?$filter=accountid eq " + id;
                AuthenticationContext authContext = new AuthenticationContext("https://login.windows.net/common", false);
                AuthenticationResult result = authContext.AcquireToken(resourceUrl, clientId, new UserCredential(account, password));
                HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(weburi);
                req.Method = "PATCH";
                req.Accept = "application/json";
                req.ContentType = "application/json; charset=utf-8";
                req.Headers.Add("OData-MaxVersion", "4.0");
                req.Headers.Add("OData-Version", "4.0");
                
                req.Headers.Set("Authorization", "Bearer " + result.AccessToken);
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

                var newSurveyResult = new JObject
                        {
                            {"stringvalue", "Hello World"},
                            {"intvalue", 123 },
                            { "booleanvalue" , true}
                        };


                byte[] data = Encoding.UTF8.GetBytes(newSurveyResult.ToString());
                Stream newStream = req.GetRequestStream();
                newStream.Write(data, 0, data.Length);
                newStream.Close();
                using (HttpWebResponse res = (HttpWebResponse)req.GetResponse())
                {
                    StreamReader read = new StreamReader(res.GetResponseStream());
                }