如果Websocket已过时，那么替换是什么？
许多资源，包括此 link 建议建议在介绍http/2之后过时的主要是由于HTTP/2中的双向通信机制。但是问题是那是什么替代者？我一直在研究HTTP协议中的一些新功能，例如服务器推送和流，我发现它们与Websocket所解决的问题无关。
我想在我的问题上添加另一点，如果Websocket已过时，是否意味着Socketio，SignalR，Pusher等也是如此？如果没有，那么他们在引擎盖下使用什么？ （除了长期民意调查）
Many resources including this link suggest that after the introduction of HTTP/2, websockets became obsolete mainly due to the bidirectional communication mechanism in HTTP/2. But the question is that what is then the replacement? I have been looking into a few new features in the HTTP protocol such as the Server Push and Streaming and I found them to be quite irrelevant to the problem that the websocket is addressing.
I would like add another point to my question which is that, if websockets are obsolete, does it mean that SocketIO, SignalR, Pusher, etc. are also obsolete as a result? If no, then what do they use under the hood? (Except for long polling)
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