Support legacy networks (WebSocket alternatives) #9
Description
Legacy networks do not support websockets, or close them quickly. To reach a wide audience, alternatives should be used in these cases.
- https://github.com/socketio/engine.io
- https://pusher.com/docs/channels/using_channels/websocket-fallbacks
We can assume modern browsers, so there is no need to use flash, but allowing HTTP polling is required to get past old firewalls, etc.