ResourceHandler sets cache headers regardless of status code

//we set caching headers before we try and serve from the cache
if (cachable && cacheTime != null) {
	exchange.getResponseHeaders().put(Headers.CACHE_CONTROL, "public, max-age=" + cacheTime);
	long date = System.currentTimeMillis() + TimeUnit.SECONDS.toMillis(cacheTime);
	String dateHeader = DateUtils.toDateString(new Date(date));
	exchange.getResponseHeaders().put(Headers.EXPIRES, dateHeader);
}

if (cache != null && cachable) {
	if (cache.tryServeResponse()) {
		return;
	}
}