docs: public List<Bucket> listBuckets()
      throws InvalidBucketNameException, NoSuchAlgorithmException, InsufficientDataException, IOException,
             InvalidKeyException, NoResponseException, XmlPullParserException, ErrorResponseException,
             InternalException {
      HttpResponse response = executeGet(null, null, null, null);
      ListAllMyBucketsResult result = new ListAllMyBucketsResult();
      result.parseXml(response.body().charStream());
      response.body().close();
      return result.buckets();
    }