code: public void doPost(String urlString,
                         OutputStream out,
                         InputStream xslInputStream,
                         Map paramsMap,
                         Map headers,
                         byte[] postData,
                         String postContentType,
                         String userName,
                         String password, String authHeader) throws IOException, MalformedURLException {
          this.authHeader = authHeader;
          doProcess(urlString, out, xslInputStream, paramsMap, headers, XmlHttpProxy.POST, postData, postContentType, userName, password);
      }
docs: This method will go out and make the call and it will apply an XSLT Transformation with the
  set of parameters provided.
  
  @param urlString - The URL which you are looking up
  @param out - The OutputStream to which the resulting document is written
  @param authHeader