You are right, I meant continuations, sorry. HN is using URLs for passing those hash keys (if they are hash keys of course), but they need to store them on the

You are right, I meant continuations, sorry. HN is using URLs for passing those hash keys (if they are hash keys of course), but they need to store them on the server as well. So URLs themselves don't solve the problem in this case. It's actually that HN doesn't use databases, where they could keep session-specific data much longer.