docs: private static void writeToFile(InputStream in, File file) {
      try {
        OutputStream out = new FileOutputStream(file);
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
          out.write(buf, 0, len);
        }
        out.close();
        in.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }