[bdimcheff]

We actually have this functionality as well: we can send a signal to the process which will cause it to display a message to the user asking them to reload to upgrade. There is a similar feature in slack and riot that I've seen as well.

Making this handoff automatic is definitely possible as well, though we do want people to reload occasionally to get new client-side code.

[specialist]

I worked on an autobahn like thingie. Server-side could tell clients to reconnect. Useful for draining servers, etc.

I haven't checked to see if autobahn has this functionality.

https://crossbar.io/autobahn/