reader.setInput(input);
                final ImageReadParam param = reader.getDefaultReadParam();
                final int width = reader.getWidth(0);
                final int height = reader.getHeight(0);
                if (width <= 0 || height <= 0) {
                    return Result.NO_IMAGE;
                }
                if (!fessConfig.validateThumbnailSize(width, height)) {

            return null;
        }

        @Override
        public void setSessionId(String sessionId) {
        }

        @Override
        public void setWeight(float weight) {
        }

        @Override
        public float getWeight() {
            return 0.0f;
        }

        @Override
        public void setCreateTime(Long createTime) {
        }

        @Override

                        // head method
                        responseData =
                                client.execute(RequestDataBuilder.newRequestData().head().url(url).weight(urlQueue.getWeight()).build());
                        if (responseData == null) {
                            return true;
                        }