C# 调用 Post Get接口

private static string Post(string url, string jsonArgs, string token, bool isUploadPdf = false, byte[] bt = null)
        {
            try
            {
                HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
                httpWebRequest.Method = "POST";
                httpWebRequest.ContentType = "application/json";
                httpWebRequest.Headers.Add("Authorization", token);
                byte[] bytes;
                if (isUploadPdf)
                {
                    bytes = bt;
                }
                else
                {
                    bytes = Encoding.UTF8.GetBytes(jsonArgs);
                }

                httpWebRequest.ContentLength = bytes.Length;
                using (Stream stream = httpWebRequest.GetRequestStream())
                {
                    stream.Write(bytes, 0, bytes.Length);
                    stream.Close();
                }
                httpWebRequest.Timeout = 5000;
                string result = Request(httpWebRequest);
                return result;
            }
            catch (WebException ex)
            {
                HttpWebResponse res = (HttpWebResponse)ex.Response;
                Stream myResponseStream = res.GetResponseStream();
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
                string retString = myStreamReader.ReadToEnd();
                
                return ex.ToString();

            }
        }

        private static string Get(string url)
        {
            try
            {
                HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
                httpWebRequest.Method = "GET";
                httpWebRequest.ContentType = "application/json";

                httpWebRequest.Timeout = 5000;
                string result = Request(httpWebRequest);
                return result;
            }
            catch (Exception ex)
            {
                return ex.ToString();
            }
        }

        private static string Request(WebRequest webRequest)
        {
            using (var response = webRequest.GetResponse())
            using (var stream = response.GetResponseStream())
            using (StreamReader streamReader = new StreamReader(stream, Encoding.UTF8))
            {
                string result = streamReader.ReadToEnd();
                return result;
            }
        }