code: private HttpResponse executeDelete(String bucketName, String objectName, Map<String,String> queryParamMap)
      throws InvalidBucketNameException, NoSuchAlgorithmException, InsufficientDataException, IOException,
             InvalidKeyException, NoResponseException, XmlPullParserException, ErrorResponseException,
             InternalException {
      HttpResponse response = execute(Method.DELETE, getRegion(bucketName), bucketName, objectName, null,
                                      queryParamMap, null, 0);
      response.body().close();
      return response;
    }
docs: Executes DELETE method for given request parameters.
  
  @param bucketName     Bucket name.
  @param objectName     Object name in the bucket.
  @param queryParamMap  Map of HTTP query parameters of the request.