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>While also ignoring that since then we've gained web sockets, HTTP/2 and HTTP/3, each of which make long-polling pointless in three different ways.

None of those have strong support across language frameworks for using them as a client from a server context. Especially http/3.

What language exactly you use that can't do web sockets, which is a thin layer over plain TCP sockets?

dream maker (which can do http, but not websockets or tcp sockets), php: https://stackoverflow.com/questions/7160899/websocket-client... , tcl.