Как передать изображение в виде base64 на сервер из url в java?

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import java.io.*;
import java.net.*;
import java.util.*;

public class Base64ImageUploader {
    public static void main(String[] args) throws Exception {
        String imageUrl = "https://example.com/image.jpg";
        URL url = new URL("https://example.com/upload");
        String encoding = Base64.getEncoder().encodeToString(getImageBytes(imageUrl));
        
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        
        String postData = "image=" + URLEncoder.encode(encoding, "UTF-8");
        OutputStream os = connection.getOutputStream();
        os.write(postData.getBytes("UTF-8"));
        os.flush();
        os.close();
        
        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            System.out.println(inputLine);
        }
        in.close();
    }
    
    private static byte[] getImageBytes(String imageUrl) throws Exception {
        URL url = new URL(imageUrl);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        InputStream is = url.openStream();
        byte[] byteChunk = new byte[4096];
        int n;
        while ((n = is.read(byteChunk)) > 0) {
            baos.write(byteChunk, 0, n);
        }
        is.close();
        return baos.toByteArray();
    }
}