RequestParameter[] params = new RequestParameter[] { new RequestParameter("q", new String[] { "test" }),
                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);