private String convertQueriesToJson(Map<String, String> queries) {
        List<String> jsons = new ArrayList<String>();
        for (String name : queries.keySet()) {
            String json = "";
            try {
                json = "%22" + URLEncoder.encode(name, "UTF-8") + "%22" + ":" + "%22" + URLEncoder.encode(queries.get(name), "UTF-8") + "%22";
            } catch (UnsupportedEncodingException ignore) {
            }
            jsons.add(json);
        }
        return "{" + z_F4JInternalStringUtil.join((String[]) jsons.toArray(new String[jsons.size()])) + "}";
    }