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What is the best way to detect when a feed has been updated? Say I have an application which polls the feed every 15 minutes. How do I find out if new content has been added or not?
For RSS as well as Atom feeds.
Each item in RSS 2 and Atom has a GUID/ID that may be flagged as unique. If it’s flagged as unique you can use it to identify items and match against the previous items.