前提条件HTTP请求失败错误

Question

在我的网络项目中，我使用http请求和响应来访问https付款网站。但是当我调用getresponse()函数时，它会返回“Precondition failed（412）”错误。

HttpWebRequest paymentRequest = (HttpWebRequest)WebRequest.Create("https://xxxxxx/authorize");
Uri uri = new Uri("https://xxxxxx/authorize");
NetworkCredential netCredential = new NetworkCredential("XXXXXXXXX", "XXXXXXXXX");
paymentRequest.Credentials = netCredential.GetCredential(uri, "Basic");
paymentRequest.PreAuthenticate = true;

byte[] Data = System.Text.Encoding.ASCII.GetBytes(sXMLTemplate);
paymentRequest.Method = "POST";
paymentRequest.Headers.Add("MIME-Version", "1.0");
paymentRequest.Headers.Add("Request-number", "1");
paymentRequest.Headers.Add("Document-type", "Request");
paymentRequest.Headers.Add("Content-transfer-encoding", "application/xml");
paymentRequest.ContentType = "application/xml";
paymentRequest.ContentLength = Data.Length;
paymentRequest.KeepAlive = true;

Stream streamWriter = paymentRequest.GetRequestStream();
streamWriter.Write(Data, 0, Data.Length);
streamWriter.Close();



HttpWebResponse paymentResponse = (HttpWebResponse)paymentRequest.GetResponse();
Stream responseStream = paymentResponse.GetResponseStream();
reader = new XmlTextReader(responseStream);

如何解决此错误？

Answer 1

请检查您正在POST的XML数据是否成功验证，并且如果强制执行XML架构，则不会缺少XML元素

Answer 2

查看有效的内容转移编码。

• BASE64
• 8BIT
• 7BIT
• BINARY
• 引用打印

application / something用于Content-Type，而不是编码。

有关详细信息，请查看此处的规范：

http://www.w3.org/Protocols/rfc1341/5_Content-Transfer-Encoding.html

我的所作所为想想你就是这样：

paymentRequest.Headers.Add("Content-type", "application/xml");

或简单地说：

paymentRequest.ContentType = "application/xml";