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I'm sure you can't get 100% of sites that have feeds but support for <link rel=alternate> is very widespread. If you want to be more aggressive you can try fetc

I'm sure you can't get 100% of sites that have feeds but support for <link rel=alternate> is very widespread. If you want to be more aggressive you can try fetching links that sound like RSS feeds from link text or URL but in practice I have found that only gets you a small amount more.

marginalia_nu 4y ago
No I mean you'll commonly encounter several RSS feeds on the same page, all rel=alternate. There doesn't seem to be any convention for indicating what the feed is about. You may get an RSS feed for the site, one for each the topic, and one for each comments section of the blog post, etc. These may then be duplicated in various ways since there's more than one path to the same page. It's a real pain in the ass.