什麼是長輪詢，Websocket，服務器發送事件（SSE）和Comet？

本文翻譯自：What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet? I have tried reading some articles, but I am not very clear on the concepts yet. 我已經嘗試閱讀一些文章，但是我對這些概念還不太清楚。 Would someone l

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