Copas 2.0.0
(http://keplerproject.github.io/copas)

Copas is a dispatcher based on coroutines that can be used for asynchroneous 
networking. For example TCP or UDP based servers. But it also features timers 
and client support for http(s), ftp and smtp requests.

It uses LuaSocket as the interface with the TCP/IP stack and LuaSec for ssl 
support

A server or thread registered with Copas should provide a handler for requests and use
Copas socket functions to send the response.
Copas loops through requests and invokes the corresponding handlers.
For a full implementation of a Copas HTTP server you can refer to Xavante as an example.

Copas is free software and uses the same license as Lua 5.1 and 5.2

Copas can be downloaded from its GitHub page.

You can also install Copas using LuaRocks:
luarocks install copas

For more details see the documentation at http://keplerproject.github.io/copas/