I've started working on generating RFC9421 compatible HTTP-Signatures in #GoActivityPub about a week and a half ago, but it felt more like a month. Writing tests for the client module took the bulk of this time and it was a proper slog. We did manage to increase code coverage from under 20% to 80% plus. This makes it a bit harder to migrate to a new API when the future version 1 of the library will be tagged, but the changes I have planned shouldn't be insurmountable. Now I just need to implement the verification, and I'll be done with what is a very large milestone for the library. :goose_hacker: #ActivityPubDev #fedidev #httpsig