websocket: Clarify the status of the package as retired

[mortie]

The websocket package is retired, as explained in golang/go#2134 (comment), and its neglect has been a topic of discussion since at least 2016 (see golang/go#18152). However, to this day, the documentation on pkg.go.dev doesn't make the status of the package clear, as I pointed out in golang/go#60467.

This PR changes the wording to explicitly state that the package is in fact retired, as opposed to simply "lacking some features".

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[binwiederhier]

@mortie There's a typo in your PR (maintained WebSoket package instead), and the linked WS package is also not well maintained.

[mortie]

@binwiederhier I fixed the typo.

I also replaced the link to nhooyr.io/websocket with a link to gorilla/websocket, since that's apparently no longer inactive; see gorilla/websocket@931041c and the announcement at https://github.com/gorilla.

[mortie]

There doesn't seem to be much interest in this. Should I just close the PR? Is the golang.org/x/net package unmaintained?

[ruyi789]

这个包满足我的，因为很小，而且是官方维护。唯一不足的地方大多数人没法用它，因为不会Read。

var c *websocket.Conn
var buf bytes.Buffer
b := make([]byte, 1024)

for {
	n, err := c.Read(b)

	if n > 0 {
		buf.Write(b[:n])
	} else if err != nil {
		return
	}

	//处理帧数据，你可能有如下三种判断之一：

	if err == io.EOF { //表示帧结束? 但是你可能永远等不到io.EOF这个值
		//处理帧数据
		buf.Reset()
	}

	//或者
	if buf.Len() == c.Len() { //c.Len()? 这方法返回没有准确表达我需要的条件，不知道有什么作用:frame.Length?
		//处理帧数据
		buf.Reset()
	}

	//或者
	if buf.Len() == int(c.FrameDataLenth()) { //ok,非常棒。但是 websocket.Conn 没有这个方法：FrameDataLenth=frame.header.Length
		//处理帧数据
		buf.Reset()
	}

}

[mortie]

Is this repo dead?