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I discovered a gotcha with rolling one’s own Webmention implementation: your server framework probably makes the response to a successful POST request redirect to the page of the created entity, hence returning a 302 status code, whereas the Webmention spec requires a 202 or 201 response. As a result brid.gy was counting attempts to notify my server as failures.
Webmention is the IndieWeb equivalent of likes, reposts, retweets, boosts, etc.—a signal to one site that you have mentioned their content on your site.
(Via Webmention (IndieWeb))
Noted by Damian Cugley .Brid.gy is a service for connecting IndieWeb sites with social media sites like Twitter.