Seaside on HN

Interesting:

Not just way back; HN uses continuations. (Not in many user-visible places any more, but every link on the front page used to be one—expired "next page" continuation links were a frequent source of grumbling.) Note that you don't have to expire continuations, necessarily—you could actually persist them statelessly (i.e. without server-side state), by shipping their encoded representations to the client embedded into HMAC-signed links. You're basically giving the server a raw bytecode-eval endpoint, and then making sure that it only accepts code you yourself wrote. Kind of a crazy strategy compared to the standard predeclared REST API, but interestingly flexible.