docs: private int handleIOException(IOException ex) throws IOException {
  		if (AUTH_ERROR.equals(ex.getMessage()) || AUTH_ERROR_JELLY_BEAN.equals(ex.getMessage())) {
  			return HttpStatus.UNAUTHORIZED.value();
  		} else if (PROXY_AUTH_ERROR.equals(ex.getMessage())) {
  			return HttpStatus.PROXY_AUTHENTICATION_REQUIRED.value();
  		} else {
  			throw ex;
  		}
  	}