[alexkus]

How it scales is an interesting question.

Could it, for example, replace a COMET server that is maintaining 100 connections (all doing long polling)? 1000? 10000?

Could it also be hacked into doing Websockets upgrade (and subsequently maintaining a large number of concurrent websockets conns)?

[FooBarWidget]

Yes and yes, but it depends on your web server.

For example, while this API allows you to implement the WebSocket protocol, Nginx's input buffering will interfere with it.