Online RSS readers send follower counts in their user agent string
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Short and sweet. Darek Kay shared that you can figure out how many people are subscribed to your blog's RSS feed. When Inoreader, Feedbin or Feedly query the feed, they'll include a subscriber count in the user agent header.
"GET /atom.xml" 304 0 "Mozilla/5.0 (compatible; inoreader.com; 9 subscribers)" "GET /atom.xml" 304 0 "Feedbin feed-id:1524967 - 5 subscribers" "GET /atom.xml" 304 0 "Feedly/1.0 (+http://www.feedly.com/fetcher.html; 16 subscribers; like FeedFetcher-Google)"
My site runs on Netlify, and unfortunately, I don't have the setup to parse logs, but I'm intrigued to set this up. 🙈