Previously discussed (April 2022; 95 comments): https://news.ycombinator.com/item?id=30904220

It could use a section on high level justification / inspiration.

For example, what inspired this over a typical paginated API that lets you sort old to new with an afterId parameter?

What happens if you need to catch up? You keep calling in a loop with a new lastEventId?

What is the intention there though. Is this for social media type feeds, or is this meant for synchronising data (at the extreme for DB replication for example!).

What if anything is expected of the producer in terms of how long to store events?

This is an astonishingly bad idea. Don't do this.

Use HTTP server-sent events instead. Those can keep the connection open so you don't have to poll to get real-time updates and they will also let you resume from the last entry you saw previously.

https://developer.mozilla.org/en-US/docs/Web/API/Server-sent...