static class BasicAuthHandler implements HttpHandler {
        public void handle(HttpExchange exchange) throws IOException {
            Headers header = exchange.getRequestHeaders();
            String auth = header.getFirst("Authorization");
            String userpass = null;

            if(auth != null){
                auth = auth.split(" ")[1];
                byte[] decoded = Base64.getDecoder().decode(auth);
                userpass = new String(decoded);
                System.out.println("auth " + auth);
                System.out.println(auth.getBytes("UTF-8"));
                System.out.println("decoded " + decoded.toString());
                System.out.println("userpass " + userpass);

            }

            if (auth == null) {
                System.out.println("Null");
                exchange.getResponseHeaders().set("WWW-Authenticate", "Basic");
                exchange.getResponseHeaders().set("charset", "UTF-8");
                exchange.sendResponseHeaders(401, 0);
                exchange.close();
            } else {
                if (!userpass.equals("user:u")) {
                    exchange.getResponseHeaders().set("WWW-Authenticate", "Basic");
                    exchange.sendResponseHeaders(401, 0);
                    exchange.close();
                } else {
                    basicAuthReq(exchange);
                }
            }
        }

        private static void basicAuthReq(HttpExchange exchange) throws IOException {
            String response = "Ta strona wymaga autoryzacji";

            exchange.sendResponseHeaders(200, response.getBytes().length);
            exchange.getResponseHeaders().set("Content-Type", "text");
            OutputStream os = exchange.getResponseBody();
            os.write(response.getBytes());
            os.close();
        }
    }