急！求大神帮忙android调用webservice时出现soapfault faultcode

Question

soapfault faultcode： 'soap :Client' faultstring 'server did not recognize the value of HTTP Header SOAP 
 HttpTransportSE ht = new HttpTransportSE(SERVICE_URL);
        ht.debug = true;
        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
        SoapObject soapObject = new SoapObject(SERVICE_NS,METHOD_NAME);
        String str = "2012S094";
        soapObject.addProperty("qihao", str);
        //soapObject.addAttribute("qihao", "2012S094");
        envelope.bodyOut = soapObject;
        envelope.dotNet = true;
        envelope.setOutputSoapObject(soapObject);
try {
ht.call(SERVICE_NS + METHOD_NAME, envelope);
if(envelope.getResponse() != null)
{
SoapObject result = (SoapObject)envelope.bodyIn;
SoapObject detail = (SoapObject)result.getProperty("kaijiangResult");
return detail.toString();

}




} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

String string = "fail";

return string;  求大神帮忙