public static String requestNoticias(String str, String str2, String str3) throws HttpResponseException, IOException, XmlPullParserException {
        SoapObject soapObject = new SoapObject(NAMESPACE, str);
        soapObject.addProperty(param_cantidad, str2);
        soapObject.addProperty(param_principales, str3);
        SoapSerializationEnvelope soapSerializationEnvelope = new SoapSerializationEnvelope(110);
        soapSerializationEnvelope.dotNet = true;
        soapSerializationEnvelope.setOutputSoapObject(soapObject);
        HttpTransportSE httpTransportSE = new HttpTransportSE(URL);

        httpTransportSE.debug = true;
        ArrayList arrayList = new ArrayList();
        StringBuilder sb = new StringBuilder();
        sb.append("Basic ");
        sb.append(Base64.encode(user.getBytes()));
        arrayList.add(new HeaderProperty("Authorization", sb.toString()));
        arrayList.add(new HeaderProperty("http.keepAlive", "false"));
        arrayList.add(new HeaderProperty("Accept-Encoding", "utf-8"));
        arrayList.add(new HeaderProperty("Accept-Charset", "utf-8"));
        arrayList.add(new HeaderProperty("Content-Type", "text/xml; charset=utf-8"));
        httpTransportSE.call(SOAP_ACTION, soapSerializationEnvelope, arrayList);
        String responseDump = httpTransportSE.responseDump;
        String respuesta = StringFormatter.convertStringToUTF8(responseDump);
        Log.d("response", responseDump);
        return responseDump;
    }