Kliendi oma
public void sendButton(View view) throws IOException{
        OkHttpClient client = new OkHttpClient();
        byte[] bytes = extractBytes(choosenImage);
        RequestBody body = RequestBody.create(MediaType.parse("image/png"),bytes);
        String url = "https://ha3kirill.herokuapp.com/";
        Request request = new Request.Builder().url(url+"/process").post(body).build();
        Response response = client.newCall(request).execute();
        byte[] responseBytes = response.body().bytes();
        Bitmap resultBitmap = BitmapFactory.decodeByteArray(responseBytes,0,responseBytes.length,bmo);
        processedPicture.setImageBitmap(resultBitmap);
    }


Serveri poolel:
post("/process",(request, response) -> {
	  	//Getting bytes
	  	byte[] requestBytes = request.bodyAsBytes();
		BufferedImage bImage = bytesToImage(requestBytes);
		//Processing
		DiffusionFilter filter = new DiffusionFilter();
		filter.setLevels(2);
		filter.setColorDither(true);
		filter.setSerpentine(true);
		BufferedImage result = filter.filter(bImage,null);
		byte[] resultBytes = extractBytes(result);
		  OutputStream out = response.raw().getOutputStream();
		  out.write(resultBytes);
		  out.close();
	  	return response.raw();
	  });