public static void main(String[] args) throws Throwable {
        try {
            String username = "****";
            String password = "****";
            String cred = Base64.encodeBytes((username + ":" + password).getBytes());

            Map<String, String> headers = new HashMap<>(1);
            headers.put("Authorization", "Basic " + cred);

            JsonRpcHttpClient client = new JsonRpcHttpClient(new URL("https://dms1.ok.by/api/v1/json­rpc"));
            String elem =  client.invoke("myMethod", new Object [] {"param"}, domain, String.class);

        }
        catch(Throwable throwable) {
            throwable.printStackTrace();
        }
    }