Eliom: Improve server to client communication

[balat]

Tasks

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1. Reimplement comet
2. Websockets

[xvw]

As COMET has become less and less popular over the years in favour of Server Side Events (for server-to-client communication) and WebScocket (for broadcast communication), is supporting COMET still viable? For legacy reasons?

[balat]

If I'm right, what we call comet is actually long polling, (which is very close to SSE, or exactly the same according to some definitions). Websockets do not work behind a firewall as it is not HTTP. That's why we cannot rely only on websockets.