怎样自定义并使用websocket子协议?
从websocket API 中了解到，websocket 可以自定义子协议，想深入了解一下，但是好像网上并没有类似的例子，请高手指点。
回复内容：
subprotocol 不过是 header 里的一个字段而已。RFC 6455 - The WebSocket Protocol
The WebSocket API 由于Websocket协议提供的是一个基于包的可靠传输协议，它并不像HTTP那样是个应用协议，它的包对内容并不像HTTP那样有Content-Type字段去描述，是一个比较底层的协议，就和TCP一样，如果要用来通信通常需要自己来定一个协议。那么subprotocol就可以作为一个标示来让服务端和客户端之间进行协商用。
客户端在进行连接的时候可以声明自己能接受的子协议类型。这和HTTP请求头里带的Accept和Accept-Encoding头字段一样，说明自己你可以接受那些类型文件，或者编码，通常是压缩类型
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Encoding:gzip, deflate, sdch
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