@VisibleForTesting
  boolean isRetryable(final StorageException exs) {
    if (exs.isRetryable()) {
      return true;
    }
    for (int code : config.retryableHttpCodes()) {
      if (exs.getCode() == code) {
        return true;
      }
    }
    return false;
  }
@ VisibleForTesting boolean isRetryable ( final StorageException exs ) { if ( exs . isRetryable ( ) ) { return true ; } for ( int code : config . retryableHttpCodes ( ) ) { if ( exs . getCode ( ) == code ) { return true ; } } return false ; }
@param exs StorageException to test
@return true if exs is a retryable error, otherwise false