就少个这个配置，就运行不起来，要命吧
httpclient.Headers.Add("Content-Type", "text/xml");
httpclient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
Nclient.addHeader("Content-Type", "text/xml");
httpclient.Headers.Add("Content-Type", "text/xml");
httpclient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
Nclient.addHeader("Content-Type", "text/xml");