Handling a body response as a byte array can be accomplished using BodyHandlers.ofByteArray(), as shown in the following snippet of code:

HttpResponse<byte[]> responseOfByteArray = client.send(
  request, HttpResponse.BodyHandlers.ofByteArray());

System.out.println("Status code: " 
  + responseOfByteArray.statusCode());
System.out.println("Body: "
  + new String(responseOfByteArray.body()));

For consuming the byte array, call ofByteArrayConsumer(Consumer<Optional<byte[]>> consumer).