text: The current code is here.
  I googled variously and tried various things, but I could not solve it, so I will ask you a question here.
  Please help someone m (_ _) m
  var xml = new StringWriter (); var serializer = new XmlSerializer (typeof (RequestXmlModel)); var namespaces = new XmlSerializerNamespaces (); namespaces.Add (string.Empty, string.Empty); RequestXmlModel request = new RequestXmlModel (); serializer.Serialize (xml, request, namespaces); using (var client = new HttpClient ()) { var request = new HttpRequestMessage (HttpMethod.Post, $"url"); request.Content = new StringContent (xml.ToString (), Encoding.UTF8); var response = await client.SendAsync (request); if (response.StatusCode == HttpStatusCode.OK) { var stream = response.Content.ReadAsStreamAsync (); using (Stream s = await stream) { using (StreamReader sr = new StreamReader (s)) { var xmlResponse = sr.ReadToEnd (); return xmlResponse; } } } return response.ToString (); }
  - Answer # 1
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  I'm sorry, this case has been resolved.
  I thought that the part described was a problem and I was addicted to it, but when I was advised that the cause was that the other party could not accept the request and reviewed it again, it seems that there was a cause in other parts and it was solved smoothly It's done.
  I made a noise m (_ _) m
  Thank you for your help!