Keycloak essential endpoint

Keycloak is one of great identity server that exist. It's opensource, and free also, by the way if you need professional support you can achieve that from Redhat.
In the Microservice paradigm, we split each business into a service, and one of important business is user management. Keycloack handle it for your system and also help your service to be secure.
Now I want share some common endpoint of Keycloak, to make your job easier.

How we sent a SMS

Once upon a time in the first company that I start my job as Java Developer, I got a task, Send SMS to our clients. Greate! I think it was Java 5 or 6 I'm not sure about it, but I'm sure our SMS provider used legacy methods to get SMS from us; I got this source from Mr. Majidi (one of kind person of that company, and also head of another team of it), and now I decide to share it here for you, may someday help somebody:


public class SMS {
    public static void sendSms(String mobile, String msg) throws Exception {
        String url = "{SERVER_URL}";
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection)obj.openConnection();
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
        con.setRequestProperty("accept-charset", "UTF-8");
        String urlParam =
                "HEADER={YOUR_SMS_NUMBER}&DESTINATION=" + "{COUNTRY_CODE}" + mobile.substring(1) +
                        "&MESSAGEID=1&MESSAGE=" + msg + "&DCS=8";
        DataOutputStream wr = new DataOutputStream(con.getOutputStream());
        BufferedWriter writer =
                new BufferedWriter(new OutputStreamWriter(wr, "UTF-8"));
        int responseCode = con.getResponseCode();
        BufferedReader in =
                new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {