I like the API and your docs are great. Do you know if there's anyone already working on concurrent server tools? At first glance, it looks like a WSAPI server implemented with LuaGravity might be a good alternative to xavante for applications where there are events that don't necessarily originate on the web interface. I'm thinking of Twisted, but without a lot of a lot. :)
I am about to release the project "Reactive Server Pages" on top of WSAPI.
I'll take a look at Twisted, although my initial intention is to handle events originating from the client.
(Most recent activity in LuaGravity is due this project and also a prototype for eLua that we are working on.)
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Francisco