This sounds very similar to warp, the Haskell web server that is known for its high-performance on many-core machines. The Web Application Interface (WAI) is also coroutine based (I believe): http://www.aosabook.org/en/posa/warp.html
Sorry for the shameless plug but I just released HTTP server based on Lua coroutines (https://github.com/raksoras/luaw) that pretty much follows the exact design from the OP article.