try (BufferedReader reader = new BufferedReader(new InputStreamReader(
                    new GZIPInputStream(
                            new ByteArrayInputStream(Base64.getUrlDecoder().decode(hash.substring(SIMILAR_DOC_HASH_PREFIX.length())))),
                    Constants.UTF_8))) {
                return ReaderUtil.readText(reader);
            } catch (final Exception e) {

                new RequestParameter("lang", new String[] { "en", "ja" }) };
        String encoded = searchHelper.serializeParameters(params);
        assertNotNull(encoded);
        byte[] compressed = Base64.getUrlDecoder().decode(encoded);
        byte[] jsonBytes = searchHelper.gzipDecompress(compressed);
        String json = new String(jsonBytes);
        assertTrue(json.contains("q"));
        assertTrue(json.contains("lang"));
    }