Added a job to my feed aggregator/Microsub server that quickly validates mf2 media, i.e., the URLs that end up in entries’ `photo` and `video` arrays, by means of a HEAD request. If the server returns a 404 (or similar), the URL is probably faulty (e.g., the result of a misplaced `u-photo` tag), and the item removed from the list. No more (well, definitely less) “broken images” below posts!
Added a basic lightbox, too. Very nice.
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