I am not sure how it will work on the heavily cached sites. GET with ActivityPub sends a header that requests a JSON response. But the regular GET needs an HTML response. Most caching plugins ignore the headers after caching.
@email@example.com I am trying. I will keep you informed. Currently I am facing issues with caching issues. With caching switched off it seems to be working.
Making the Social Web a Better Place: ActivityPub for WordPress Joins the Automattic Family https://wordpress.com/blog/2023/03/17/making-the-social-web-a-better-place-activitypub-for-wordpress-joins-the-automattic-family/
This is huge.