code: public void upload(Context context, final String text, final ProgressListener progressListener, ResponseListener responseListener) {
          setContext(context);
          super.upload(text, progressListener, responseListener);
      }
docs: Upload text asynchronously.
  If no Content-Type header was set, this method will set it to "text/plain".
  
  @param context           The context that will be passed to authentication listener.
  @param text              The text to upload
  @param progressListener  The listener that monitors the upload progress
  @param responseListener  The listener whose onSuccess or onFailure methods will be called when this request finishes