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> Anything that has updates and doesn't need to be an instant notification.

I wonder if there's an easy/obvious way to enhance RSS with instant (or near-instant) notification capability. Perhaps HTTP long polling/Websocket? For small setups, it wouldn't scale/cache as easily as "check this URL every hour, and remember to include ETag/If-Modified-Since", so perhaps for public feeds it could be done via a specialized aggregator / caching proxy network? Maybe model the API after Pushover? <https://pushover.net/api/client#websocket>

Use cases is any kind of feed that can update in very short intervals (minutes), or benefits from quick round-trip times, but the exact update frequency can be extremely irregular. For example status alerts, social media posts, blog/forum comments, security updates.




“websub” is what you are looking for: https://www.w3.org/TR/websub/


It seems this is a server-to-server protocol? Subscriber is required to accept HTTP requests, which makes it mostly useless for most contexts where RSS is used.


It's a little funny to me that the response to "these notifications don't need to be realtime" is "let's make RSS realtime"


Because there are applications that could benefit from it?


Because the proposed solution complicates RSS in what it was designed to solve




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