# content
One (small) issue is that it assumes there *is* a client outside of the server. Most server apps have both a web UI and an API, and it's even possible to build an ActivityPub server with no client API at all (microblog.pub was like that, IIRC). I think the ActivityPub C2S API was intended for servers that worked just like you're describing, but IDK if anyone ever really implemented it properly.