The application is minimized when the code is executed

I am writing the simplest application for Android. I receive all the HTML of the site and display this text on the smartphone screen. All this happens in Android Studio. Created a project using the "Fragment + ViewModel" template. In MainActiviti, using the getContent method, I connect to the site and read its HTML. The method works, but as soon as I try to transfer the text to the screen, the application is immediately minimized on startup. Tell me what's wrong.

public class MainFragment extends Fragment{
    final public String URL_POSTER = "https://udmfil.ru/";


    public static MainFragment newInstance() {
        return new MainFragment();
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        DownLoad FOG = new DownLoad();
        FOG.execute(URL_POSTER);
        String result_post = String.valueOf(FOG);
        Log.i("URL",result_post);
        return inflater.inflate(R.layout.main_fragment, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        new ViewModelProvider(this).get(MainViewModel.class);
    }
    public class DownLoad extends AsyncTask<String,Void,String[]> {

        @Override
        protected String[] doInBackground(String... strings) {
            HttpURLConnection connection = null;
            BufferedReader reader= null;

            try {
                URL url = new URL(strings[0]);
                connection = (HttpURLConnection) url.openConnection();
                connection.connect();

                InputStream stream = connection.getInputStream();
                reader = new BufferedReader(new InputStreamReader(stream));

                StringBuilder buffer = new StringBuilder();
                String line;

                while ((line = reader.readLine()) != null)
                    buffer.append(line);
                    Log.i("URL", String.valueOf(buffer));
                /*String pos = buffer.toString();
                int indexPost, i = 1;
                String postB;
                do {
                    indexPost = pos.indexOf("m-img buy") + 21;
                    Log.i("URL", String.valueOf(indexPost));
                    if (indexPost != -1){
                        postB = pos.substring(indexPost, indexPost + 55);
                        Log.i("URL",postB);
                        strings[i] = postB;
                        indexPost = indexPost +55;
                        pos = pos.substring(indexPost);
                        Log.i("FLAG",pos);
                        i++;
                        Log.i("FLAG",strings[i]);
                        Log.i("URL", String.valueOf(i));
                    }
                }while (indexPost != -1);*/
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (connection != null)
                    connection.disconnect();
                try {
                    if (reader != null)
                        reader.close();
                }catch (IOException e){
                    e.printStackTrace();
                }

            }

            return strings;
        }
    }
}

error log:

java.lang.RuntimeException: An error occurred while executing doInBackground()
 at android.os.AsyncTask$4.done(Unknown Source:27)
 at java.util.concurrent.FutureTask.finishCompletion(Unknown Source:36)
 at java.util.concurrent.FutureTask.setException(Unknown Source:23)
 at java.util.concurrent.FutureTask.run(Unknown Source:40)
 at android.os.AsyncTask$SerialExecutor$1.run(Unknown Source:2)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source:79)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source:2)
 at java.lang.Thread.run(Unknown Source:4)
Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
 at java.net.Inet6AddressImpl.lookupHostByName(Unknown Source:111)
 at java.net.Inet6AddressImpl.lookupAllHostAddr(Unknown Source:22)
 at java.net.InetAddress.getAllByName(Unknown Source:3)
 at com.android.okhttp.Dns$1.lookup(Dns.java:41)
 at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:178)
 at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:144)
 at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:86)
 at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:176)
 at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128)
 at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
 at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289)
 at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:232)
 at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465)
 at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:131)
 at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:90)
 at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:30)
 at com.example.myapplication.ui.main.MainFragment$DownLoad.doInBackground(MainFragment.java:58)
 at com.example.myapplication.ui.main.MainFragment$DownLoad.doInBackground(MainFragment.java:48)
 at android.os.AsyncTask$3.call(Unknown Source:20)
 at java.util.concurrent.FutureTask.run(Unknown Source:31)
Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
 at libcore.io.Linux.android_getaddrinfo(Native Method)
 at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:74)
 at libcore.io.BlockGuardOs.android_getaddrinfo(BlockGuardOs.java:200)
 at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:74)
 at java.net.Inet6AddressImpl.lookupHostByName(Unknown Source:51)
Caused by: android.system.ErrnoException: android_getaddrinfo failed: EACCES (Permission denied)
 

Now this is how it turns out.