docs: public static SimpleResponse makeResponse(SimpleRequest request) {
      if (request.getResponseSize() > 0) {
        if (!Messages.PayloadType.COMPRESSABLE.equals(request.getResponseType())) {
          throw Status.INTERNAL.augmentDescription("Error creating payload.").asRuntimeException();
        }
  
        ByteString body = ByteString.copyFrom(new byte[request.getResponseSize()]);
        Messages.PayloadType type = request.getResponseType();
  
        Payload payload = Payload.newBuilder().setType(type).setBody(body).build();
        return SimpleResponse.newBuilder().setPayload(payload).build();
      }
      return SimpleResponse.getDefaultInstance();
    }