> For the complete documentation index, see [llms.txt](https://jon-xia.gitbook.io/workspace/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jon-xia.gitbook.io/workspace/gong-cheng-3/ji-suan-ji-wang-luo/websocket.md).

# websocket

* websocket是什么？

  WebSocket是为解决客户端与服务端实时通信而产生的技术。其本质是先通过HTTP/HTTPS协议进行握手后创建一个用于交换数据的TCP连接，此后服务端与客户端通过此TCP连接进行实时通信。
* websocket的优点

  以前我们实现推送技术，用的都是轮询，在特点的时间间隔浏览器自动发出请求，将服务器的消息主动的拉回来，在这种情况下，我们需要不断的向服务器发送请求，然而HTTP request 的header是非常长的，里面包含的数据可能只是一个很小的值，这样会占用很多的带宽和服务器资源。会占用大量的带宽和服务器资源。
* WebSocket API最伟大之处在于服务器和客户端可以在给定的时间范围内的任意时刻，相互推送信息。在建立连接之后，服务器可以主动传送数据给客户端。 此外，服务器与客户端之间交换的标头信息很小。 WebSocket并不限于以Ajax(或XHR)方式通信，因为Ajax技术需要客户端发起请求，而WebSocket服务器和客户端可以彼此相互推送信息；
*


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