This sounds crazy, I know, but after three days of testing myself round and round in circles, I am beginning to think that there is some fundamental way in which the Grav webmention plugin behaves very differently in a local MAMP development environment versus the live, production environment.
I need to go back to first principles, I think. If only I could work out what those are.
Two ways to respond: webmentions and comments
Webmentions
Webmentions allow conversations across the web, based on a web standard. They are a powerful building block for the decentralized social web.
“Ordinary” comments