C# HttpWebRequest進行POST請求(https) 提示{"遠端伺服器傳回一個錯誤: (400) 不正確的要求。"}

Question

框架: .net framework4.5.2
要向第三方服务器进行post请求(https), 用VS studio2019 启动测试, 提示: {"远端服务器传回一个错误:(400)不正确的要求。"} , 可以确定的是URL拼写对的, 请问是什么原因? 会是因为本地是 http 的缘故吗?
代码如下 :

                ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12; 
                HttpWebRequest request = WebRequest.Create(URL) as HttpWebRequest;
                request.ProtocolVersion = HttpVersion.Version10;
                request.UserAgent = DefaultUserAgent;

                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.Timeout = 120000;

                Encoding encoding = Encoding.UTF8;
                var postData = "userName=" + Uri.EscapeDataString("myuser") ;
                byte[] data = Encoding.UTF8.GetBytes(postData);
                request.ContentLength = data.Length;
                using (Stream stream = request.GetRequestStream())
                {
                    stream.Write(data, 0, data.Length);
                    stream.Close();
                }

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream myResponseStream = response.GetResponseStream();
                StreamReader myStreamReader = new StreamReader(myResponseStream, encoding);
                string res = myStreamReader.ReadToEnd();
                myStreamReader.Close();
                myResponseStream.Close();

Answer 1

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