I don't know if Zeit Now (while really cool!) would work for NodeBB... NodeBB is a web application, and does lots of stuff in the background that relies on a server running. To have a service that spins up whenever a request comes in would be much too slow, if only because that first spin up would take many seconds!
NodeBB Websocket Question
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Technical Support
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One per (online) user.
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On Concurrent WebSockets connections...
A Lightstreamer plugin would be interesting to see. Likely overkill in most situations though. Carving out the websockets demand on resources could be good in large deployments; lightstreamer server. With Comet functionality, one could hook into big data analytic platforms.