@Override
    public Throwable fillInStackTrace() {
        if (Flags.verboseExceptionSampler().isSampled(getClass())) {
            return super.fillInStackTrace();
        }
        return this;
    }
Returns the {@link HttpResponse} which would be sent back to the client who sent the
corresponding request.
core/src/main/java/com/linecorp/armeria/server/HttpResponseException.java