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

HttpResponse<InputStream> responseOfInputStream = client.send(
  request, HttpResponse.BodyHandlers.ofInputStream());

System.out.println("
HttpResponse.BodyHandlers.ofInputStream():");
System.out.println("Status code: " 
  + responseOfInputStream.statusCode());

byte[] allBytes;
try (InputStream fromIs = responseOfInputStream.body()) {
  allBytes = fromIs.readAllBytes();
}

System.out.println("Body: "
  + new String(allBytes, StandardCharsets.UTF_8));