Why no data is being written in the file?

Question

I created an application to download image file from url, but there isin't any data in the file

Image URL: https://instagram.fidr1-1.fna.fbcdn.net/v/t51.2885-15/e35/190664842_184685183538740_5039921250568173600_n.jpg?tp=1&_nc_ht=instagram.fidr1-1.fna.fbcdn.net&_nc_cat=108&_nc_ohc=RrEU4lTwYCwAX-vgVQ4&edm=AABBvjUBAAAA&ccb=7-4&oh=3ac34be54793fa59134380fd9e0bd617&oe=60DCB7E6&_nc_sid=83d603

The code:

@Override
protected Void doInBackground(String... strings) {

    try {
        URL url = new URL(strings[0]);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestProperty("User-Agent", "Mozilla/5.0 
        (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) 
        Gecko/20100316 Firefox/3.6.2");
        con.setRequestMethod("GET");
        con.setDoOutput(true);
        con.connect();

        File file = Environment.getExternalStorageDirectory();
        File f1 = new File(file, "_Url download");
        if(!f1.exists()){
            f1.mkdir();
        }

        fileName = System.currentTimeMillis() + ".jpg";

        File f2 = new File(f1, fileName);
        f2.createNewFile();

        InputStream er = con.getErrorStream();
        Log.i("ErrorCode", con.getResponseCode()+"");
        Log.i("ErrorMessage", con.getResponseMessage());
        Log.i("ErrorStream", er+"");

        InputStream in = con.getInputStream();
        FileOutputStream out = new FileOutputStream(f2);

        byte[] buffer = new byte[1024];
        int len;

        System.out.println(Arrays.toString(buffer));

        while((len = in.read(buffer, 0, 1024)) > 0) {
            out.write(buffer, 0, len);
        }

        out.close();
        in.close();

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (ProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        Log.i("IOException", e.toString());
    }
    return null;
}

Result:

Image of file path where the file is being saved

EDIT

Download Button:

downloadButton.setOnClickListener(v -> {
            if(ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)  != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 101);
            }
            if(ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)  != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 102);
            }
            else if(ContextCompat.checkSelfPermission(this, Manifest.permission.INTERNET)  != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.INTERNET}, 103);
            }
            else {
                BackgroundTask task = new BackgroundTask(this);
                task.execute(et.getText().toString());
            }
        });

Manifest Permissions:

<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.INTERNET"/>

EDIT2

Log:

2021-06-26 09:26:25.532 26760-26890/com.example.urldownload I/ErrorCode: 400

2021-06-26 09:26:25.533 26760-26890/com.example.urldownload I/ErrorMessage: Bad Request

2021-06-26 09:26:25.533 26760-26890/com.example.urldownload I/Errorstream: buffer(com.android.okhttp.internal.http.Http1xStream$FixedLengthSource@fbb2c70).inputStream()

2021-06-26 09:26:25.534 26760-26890/com.example.urldownload I/IOException: java.io.FileNotFoundException: https://instagram.fidr1-1.fna.fbcdn.net/v/t51.2885-15/e35/190664842_184685183538740_5039921250568173600_n.jpg?tp=1&_nc_ht=instagram.fidr1-1.fna.fbcdn.net&_nc_cat=108&_nc_ohc=RrEU4lTwYCwAX-vgVQ4&edm=AABBvjUBAAAA&ccb=7-4&oh=3ac34be54793fa59134380fd9e0bd617&oe=60DCB7E6&_nc_sid=83d603

Answer 1

Have a look at this SO answer. It seems setDoOutput(true) changes request method to POST.