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Apron Chat Protocol
A small JSON-over-WebSocket chat spec for teams, households and their bots
If you want group chat on your own server without Matrix's weight, this gives you a short spec plus working servers and clients to start from.
Apron separates chat clients from servers with a compact protocol: JSON frames over WebSocket, a mandatory core for auth, identities, rooms and messages, and optional capabilities that each define a fallback. It is aimed at small groups that trust the server, so it skips federation and end-to-end encryption on purpose. There is a Go reference server, minimal Python and Bun servers, a web client and a GitHub PR bot. Code is MIT and the spec CC0. From Andrey Petrov, maker of ssh-chat.
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