class RestRequest {

    public static JsonElement fetchJson(String username, String password, String urlEndpoint) throws IOException {
        URL url = new URL(urlEndpoint);
        URLConnection urlConnection = url.openConnection();

        if (username != null && password != null) {
            String authString = username + ":" + password;
            byte[] encodedBasicAuth = Base64.encodeBase64(authString.getBytes());
            String encodedBasicAuthStr = new String(encodedBasicAuth);
            
            urlConnection.setRequestProperty("Authorization", "Basic " + encodedBasicAuthStr);
        }

        urlConnection.setRequestProperty("Accept", "application/json");
        urlConnection.connect();

        JsonReader reader = new JsonReader(new InputStreamReader(urlConnection.getInputStream()));
        JsonParser parser = new JsonParser();

        return parser.parse(reader);
    }

}