Ruby and Python (not to mention basically every other language) have a plethora of threaded, forking, and evented models for concurrency. Thin/Rack/Sinatra, for

Ruby and Python (not to mention basically every other language) have a plethora of threaded, forking, and evented models for concurrency. Thin/Rack/Sinatra, for example, behaves capably in a thread-per-request mode. Reactor systems are not the only (nor are they even preferable in many cases) choice.