This is a test reply from Omnibear, to try and isolate why webmentions appear not to be being sent by WithKnown.

@cn Nah. Definite case of pebcac; it was the receiver, not the sender, that was at fault. https://stream.jeremycherfas.net/2019/somewhere-along-the-line-i-seem-to

@stream.jeremycherfas.net my problems are usually pebkac 🙃