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Re:Server-sent events, WebSockets, and HTTP by taf2 on Sunday February 20, 2022 @08:45AM (#30405624)
This works great just not for safari since for some reason the WebKit team felt in 2015 it made since to remove SharedWorkers

https://stackoverflow.com/questions/28310501/why-did-safari-...

Re:Server-sent events, WebSockets, and HTTP by infomax on Friday February 25, 2022 @03:31AM (#30464931)
From the link you shared it looks like they are restoring the functionality:

https://bugs.webkit.org/show_bug.cgi?id=230382