Hi all! I have my own (small) AP implementation, https://fed.brid.gy/, and I saw a bit of surprising interop behavior the other day. I was debugging a bug on my end where it omits actor
entirely. It sent a Follow
without actor
to a Mastodon instance, and surprisingly that activity still worked, and the user showed up on the target’s following page.
Full activity below. Any idea what happened? My only guess is that the missing actor was inferred from the HTTP Signature keyId
.
{
"@context": "https://www.w3.org/ns/activitystreams",
"id": "https://fed.brid.gy/r/https://gregorlove.com/2022/11/followed-anthony-ciccarello/",
"url": "https://fed.brid.gy/r/https://gregorlove.com/2022/11/followed-anthony-ciccarello/",
"type": "Follow",
"object": "https://toot.cafe/users/aciccarello",
"published": "2022-11-15 11:04-0800",
"content": "<p>Followed <a class=\"u-follow-of\" href=\"https://toot.cafe/@aciccarello\">Anthony Ciccarello</a> on <a href=\"https://toot.cafe/\">toot.cafe</a></p>",
"to": [
"https://www.w3.org/ns/activitystreams#Public"
]
}