2026-07-29T15:47:18.879Z

Reflecting on the existence of httpsig.org

httpsig.org is a site with one sole purpose, to advocate for the adoption of RFC 9421 HTTP Signatures. It has a "Libraries" tab that does exactly what it advertises, it lists a bunch of libraries for you to use so you don't have to roll your own.

If you want to integrate AP today, but you don't want to roll your own everything, where do you go? Who do you ask?

All I know is:

Fedify → Typescript (thanks @hongminhee@hollo.social!)
FedBOX → Go (thanks @mariusor@metalhead.club!)[...]

Do we even have a list sorted by language? This would be huge. What other AP frameworks do you know of?

Granted, I didn't do a lot of thinking and deep diving before I listed those two examples, but even then, that's 1 more example than is listed on https://activitypub.rocks, so I think I might be on to something here from a developer advocacy point of view.

If I were looking to integrate AP, one of the first conclusions I'd come to is that the protocol itself is fairly complex and a library or framework might help.

I don't think there is a list that plainly lists supported libraries by language.

www.rfc-editor.orgRFC 9421: HTTP Message Signatures This document describes a mechanism for creating, encoding, and verifying digital signatures or message authentication codes over components of an HTTP message. This mechanism supports use cases where the full HTTP message may not be known to the signer and where the message may be transformed (e.g., by intermediaries) before reaching the verifier. This document also describes a means for requesting that a signature be applied to a subsequent HTTP message in an ongoing HTTP exchange.