We've built a pretty cool library for Express that makes it easy to do WebSocket stuff through Pushpin (a proxy server). http://blog.fanout.io/2015/03/09/statel

We've built a pretty cool library for Express that makes it easy to do WebSocket stuff through Pushpin (a proxy server). http://blog.fanout.io/2015/03/09/stateless-websockets-with-express-and-pushpin/ http://blog.fanout.io/2015/03/09/stateless-websockets-with-e... Not that this was covered in the article, but it would be a reason to choose Express as the backend. It would be cool to build something similar for Koa though.