AuthenticateJwt.java

public boolean authenticateJwt(Request request, String baseUrlAndAuthPort) {
    String jwt, output, valid = "";

    try {
        jwt = (request.getHeader("Authorization").split(" "))[1];
    } catch (NullPointerException | ArrayIndexOutOfBoundsException e) {
        return false;
    }

    try {
        URL url = new URL(baseUrlAndAuthPort + "/jwts/" + jwt);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setRequestProperty("Accept", "application/json");

        if (conn.getResponseCode() != 200) {
            return false;
        }

        BufferedReader br = new BufferedReader(new InputStreamReader(
                (conn.getInputStream())));

        while ((output = br.readLine()) != null) {
            valid = output;
        }

        conn.disconnect();
    } catch (IOException e) {
        return false;
    }

    return Boolean.parseBoolean(valid);
}