Long Polling: Also known as Asynchronous Polling, this method is a hybrid of pure server push and client pull.
长时间轮询：也就是所谓的异步轮询，这种方式是纯服务器端推送方式和客户端拉取方式的混合。
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In this article, I discussed various approaches for simulating a server push, ranging from pure polling to a real-time server push, and noted the strengths and weaknesses of each approach.