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Re:The future of web software is HTML over WebSockets by meheleventyone on Thursday February 25, 2021 @04:59PM (#26268875)
The nice thing about persistent connections is that you know when they’ve been closed so you could literally signal that the connection was going down for a deployment and close everyone’s connection. Clients can retry the connection until it comes back up or use another service to monitor the status.

Games basically do this routinely.

Re:The future of web software is HTML over WebSockets by rootusrootus on Thursday February 25, 2021 @05:58PM (#26269423)
But you can do that sort of communication already with existing websockets, without trying to add the complexity of pushing all your regular traffic over that link.