api post 请求纪要

{"timestamp":"2020-08-27T03:51:50.524+0000","status":415,"error":"Unsupported Media Type","message":"Invalid mime type \"Content-Type: application/json\": Invalid token character ‘:‘ in token \"Content-Type: application\"","path":"/app/user/login"}HTTP/1.1 100 Continue

  /// 

            /// 向指定 URL 发送POST方法的请求
            /// 
            /// 发送请求的 URL
            /// 请求参数，请求参数应该是Json格式字符串的形式。
            /// 所代表远程资源的响应结果
            public static string SendPost(string url, string jsonData)

            {
                string result = String.Empty;
                try
                {
                    CookieContainer cookie = new CookieContainer();

                    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                    request.Method = "POST";
                    //request.Headers.Add("x-requested-with", "XMLHttpRequest");
                    //request.ServicePoint.Expect100Continue = false;
                    request.ContentType = "application/json";
                    request.Accept = "application/json";
                    //request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)";
                    request.ContentLength = Encoding.UTF8.GetByteCount(jsonData);
                    request.CookieContainer = cookie;
                    using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
                    {
                        writer.Write(jsonData);
                    }

                    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                    response.Cookies = cookie.GetCookies(response.ResponseUri);
                    using (Stream responseStream = response.GetResponseStream())
                    {
                        using (StreamReader reader = new StreamReader(responseStream))
                        {
                            result = reader.ReadToEnd();

                            reader.Close();
                        }
                        responseStream.Close();
                    }
                    response.Close();
                    response = null;
                    request = null;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("发送GET请求出现异常：" + ex.Message);
                }
                return result;
            }