final OkHttpClient client = new OkHttpClient();
        FormBody.Builder formBuilder = new FormBody.Builder();

// dynamically add more parameter like this:
        formBuilder.add("_lang", "ru");
        formBuilder.add("_back_url", "");
        formBuilder.add("email", "rasulovmuzaffar@gmail.com");
        formBuilder.add("password", "20011987");

        RequestBody formBody = formBuilder.build();

        Request request = new Request.Builder()
                .url("http://poisk-vagona.uzrailway.uz/api/login")
                .post(formBody)
                .build();

        HashSet<String> cookies = new HashSet<>();
        Map<String, String> map = new HashMap<>();

        try (Response response = client.newCall(request).execute();) {
            System.out.println("/////////////////////");
            System.out.println(">>>>>>>>>>>> " + response.priorResponse().headers());
            System.out.println("/////////////////////");
            System.out.println(response.headers());
            if (!response.headers("Set-Cookie").isEmpty()) {
                for (String header : response.headers("Set-Cookie")) {
                    cookies.add(header);
                    System.out.println(header);
                }
            }


            System.out.println(">>>> "+response.header("Set-Cookie"));

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

            cookies.forEach((v) -> {
                map.put("Cookie", v);
            });


        Headers headers = Headers.of(map);


        Request req = new Request.Builder().url("http://test.uz/")
//                .addHeader("Cookie", str)
                .headers(headers)
                .build();
        try (Response resp = client.newCall(req).execute();) {
            System.out.println(resp.body().string());
        } catch (IOException e) {
            e.printStackTrace();
        }