procedure TForm1.Button5Click(Sender: TObject);
var
xml: string;
http : TIdHttp;
req  : TIdMultiPartFormDataStream;
data : TStream;
resp,resp2: TStringStream;
N: IXMLNode;
begin
        http := TIdHTTP.Create(nil);
                      http.Intercept:=IdLogFile1;
                     IdLogFile1.Active:=true;
                    data := TBytesStream.Create(TEncoding.Utf8.GetBytes(xml));
                    req := TIdMultiPartFormDataStream.Create;
                    req.AddFormField('xml_file', 'text/xml', 'utf-8', data, 'client.xml');
                    resp := TStringStream.Create;
                    resp2 := TStringStream.Create;
                  try
                  http.Get('http://10.10.1.233:8080/opt/out?replyId=3f194a84-49af-46ef-b145-2612896ed4a8', resp);
                  finally
                  ShowMessage(http.Response.ResponseText);
              //    memo1.Lines.append(resp.DataString);
                  XMLDocument1.XML.Text := resp.DataString;
                  XMLDocument1.Active:=true;
               //   memo1.Lines.Add(VarToStr(XMLDocument1.DocumentElement.ChildValues[0]));
                  http.Get(VarToStr(XMLDocument1.DocumentElement.ChildValues[0]), resp2);
                  XMLDocument2.XML.Text := resp2.DataString;
[color=red]                   memo1.Lines.append(resp2.DataString);
                  memo1.Lines.Add('а вот тут ошибка');[/color]
                  XMLDocument2.Active:=true;
                  memo1.Lines.append(resp2.DataString);
                  memo1.Lines.Add('10');
                  memo1.Lines.Add(GetNodeValue(XMLDocument2,'ns:Document/ns:Ticket/tc:Result/tc:Comments'));
                  resp.Free;
                  end;

end;

<?xml version="1.0" encoding="utf-8"?>
<ns:Documents xmlns:tc="http://fsrar.ru/WEGAIS/Ticket" xmlns:oref="http://fsrar.ru/WEGAIS/ClientRef" xmlns:ns="http://fsrar.ru/WEGAIS/WB_DOC_SINGLE_01" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" Version="1.0">
  <ns:Owner>
    <ns:FSRAR_ID>3463047</ns:FSRAR_ID>
  </ns:Owner>
  <ns:Document>
    <ns:Ticket>
      <tc:TicketDate>2019-02-21T15:47:38.4059084</tc:TicketDate>
      <tc:Identity />
      <tc:DocId>D8FE693C-061E-4FFB-A7E0-08EBAD56ECE9</tc:DocId>
      <tc:TransportId>3f194a84-49af-46ef-b145-2612896ed4a8</tc:TransportId>
      <tc:RegID />
      <tc:DocHash />
      <tc:DocType>QueryResendDoc</tc:DocType>
      <tc:Result>
        <tc:Conclusion>Rejected</tc:Conclusion>
        <tc:ConclusionDate>2019-02-21T15:47:38.4059084</tc:ConclusionDate>
        <tc:Comments>Накладная не найдена или предназначена другому грузополучателю Владелец ["020000442214"]. 
</tc:Comments>
      </tc:Result>
    </ns:Ticket>
  </ns:Document>
</ns:Documents>