Json.java

res -> {
	if (res.succeeded()) {
		byte[] bytes = (byte[]) res.result();
		response.putHeader("Content-Type", "application/octet-stream");
		response.setChunked(true);
		response.write(Buffer.buffer(bytes));
		response.setStatusCode(200);
		response.end();
	} else {
		response.setStatusCode(500);
		response.setStatusMessage("Internal error: " + res.cause().getMessage());
		response.end();
	}
});