auth http

 String userName = txtUsername.getText();
        String password = txtPassword.getText();

        try {

            String urlParameters = "username=" + userName + "&password=" + password;
            byte[] postData = urlParameters.getBytes(StandardCharsets.UTF_8);
            int postDataLength = postData.length;
            String request = "http://localhost/osnovna_sredstva/web/index.php?r=service-user/login";
            URL url = new URL(request);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setInstanceFollowRedirects(false);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("charset", "utf-8");
            conn.setRequestProperty("Content-Length", Integer.toString(postDataLength));
            conn.setUseCaches(false);
            try (DataOutputStream wr = new DataOutputStream(conn.getOutputStream())) {
                wr.write(postData);
            } catch (Exception e) {
                e.printStackTrace();
            }

            String success = "";
            try (DataInputStream is = new DataInputStream(conn.getInputStream())) {
                success = is.readLine();
                System.out.println(success);

            } catch (Exception e) {
                e.printStackTrace();
            }

            if ("OK".equals(success)) {
                RootController.password = password;
                RootController.username = userName;
                System.out.println("Sve ok");
                Stage stage = new Stage();
                Parent root = FXMLLoader.load(getClass().getResource("/osnovna_sredstva_desktop/view/MainView.fxml"));
                Scene scene = new Scene(root);
                stage.setTitle("Main form");
                stage.setScene(scene);
                ((Stage) lbglLogin.getScene().getWindow()).close();
                stage.show();
            } else {
                lbglLogin.setText("Wrong username or password.");
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }