为什么我们需要网络套接字? [英] Why do we need web-sockets?

问题描述

这更像是一个 n00b 问题，但我从来没有真正知道答案.

This is more of a n00b question, but I've never really known the answer.

那为什么我们需要 websockets 协议?

so why do we need the websockets protocol?

以及，与彗星式/长轮询/挂起 GET 式 HTTP 使用相比，有哪些优势?

and, what are the advantages over comet-style/long poll/hanging GET-style use of HTTP?

推荐答案

Comet 和 Ajax 都可以提供终端用户体验，提供类似桌面的功能和低用户感知延迟，只有 Web Sockets 兑现了提供的承诺一种本地方式，以可忽略的延迟准确有效地将事件传入和传出浏览器.

Comet and Ajax can both deliver end-user experiences that provide desktop-like functionality and low user-perceived latency, only Web Sockets lives up to the promise of providing a native means to accurately and efficiently stream events to and from the browser with negligible latency.

通过轮询，它会发出不必要的请求，因此，在低消息速率的情况下，许多连接被不必要地打开和关闭.(与轮询一样，它会定期发送 HTTP 请求并立即收到响应.)

With polling it makes unnecessary requests and, as a result, many connections are opened and closed needlessly in low-message-rate situations.(as with polling it sends HTTP requests at regular intervals and immediately receives a response.)

Web Sockets 消除了开销并显着降低了复杂性.

Web Sockets remove the overhead and dramatically reduce complexity.

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