Authorization on the site using OkHttp

I’m trying to go to my university’s website and parse the necessary information (such as a schedule and so on). I checked the work on reqres.in and everything works, but on my site there is no answer (onFailure is called). I wrote all the same in Python, everything worked and the site started up. Maybe I’m missing something, I ask for help.

Python code that works

import requests
import re

s = requests.Session()
s.get("https://lk.sut.ru/cabinet/")

def login_bonch(login, password):
    data = {'users': login,
            'parole': password}

    r = s.post("https://lk.sut.ru/cabinet/lib/autentificationok.php", data = data)
    return r.text // Function returns 1

Code in Android Studio that does not work

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        init();

        OkHttpClient client = new OkHttpClient();

        RequestBody formBody = new FormBody.Builder()
                .add("users", "username@gmail.com")
                .add("parole", "password123")
                .build();

        Request request = new Request.Builder()
                .url("https://lk.sut.ru/cabinet/lib/autentificationok.php")
                .post(formBody)
                .build();

        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                Log.d("SendLog", "Error");
                e.printStackTrace();
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                Log.d("SendLog", " " + response.body().string());
            }
        });
    }

I hope now attached the right (stack trace)

2020-06-11 03:47:46.560 2287-2315/com.foxartstd.lkbonchapp W/System.err: java.net.ProtocolException: Too many follow-up requests: 21
2020-06-11 03:47:46.560 2287-2315/com.foxartstd.lkbonchapp W/System.err:     at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.kt:127)
2020-06-11 03:47:46.560 2287-2315/com.foxartstd.lkbonchapp W/System.err:     at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:100)
2020-06-11 03:47:46.560 2287-2315/com.foxartstd.lkbonchapp W/System.err:     at okhttp3.internal.connection.RealCall.getResponseWithInterceptorChain$okhttp(RealCall.kt:197)
2020-06-11 03:47:46.560 2287-2315/com.foxartstd.lkbonchapp W/System.err:     at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:502)
2020-06-11 03:47:46.560 2287-2315/com.foxartstd.lkbonchapp W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
2020-06-11 03:47:46.561 2287-2315/com.foxartstd.lkbonchapp W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
2020-06-11 03:47:46.561 2287-2315/com.foxartstd.lkbonchapp W/System.err:     at java.lang.Thread.run(Thread.java:761)

I can’t understand how to transfer the code from Python to the android application. I understand that maybe I'm missing the start of a web session, but I don’t know how to implement this in Java.

The answer began to come, but I can’t show it. Added these lines

ClearableCookieJar cookieJar =
                new PersistentCookieJar(new SetCookieCache(), new SharedPrefsCookiePersistor(getApplicationContext()));

OkHttpClient client = new OkHttpClient.Builder()
                .cookieJar(cookieJar)
                .followRedirects(FALSE)
                .followSslRedirects(FALSE)
                .build();

I'm trying to get the answer like this, and I get only Ok

 client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                Log.d("SendLog", "Error");
                e.printStackTrace();
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                String MyResult = response.body().string();
                Log.d("SendLog", "Ok " + MyResult);
            }