4 ms·
(offline) Cache invalidation is a very hard thing to do. If you are going to ask the network if your DNS cache is still valid, you might as well get the latest
by csunbird 6y ago
(offline) Cache invalidation is a very hard thing to do. If you are going to ask the network if your DNS cache is still valid, you might as well get the latest value anyways, since DNS queries are tiny.