How does RSS reader know that a feed is updated?

rss push
Mith picture Mith · Dec 29, 2009 · Viewed 28.5k times · Source

Just learning about this via youtube but could not find answer to my question of how reader knows there is an update.

Is it like a Push in blackberry?

Answer

Gabriel picture Gabriel · Jan 9, 2013

RSS is a file format source and doesn't actually know anything about where it gets the entries from. The answer really is: "how can an http request get only the newest results from a server" and the answer is Conditional GET source. Http also supports Conditional PUT.

This is an article about using this feature of http to specifically support rss hackers.

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