此内容 v2.8.6 后支持

---

SubProtocolCapable

```java
@ServerEndpoint("/")
public class WebSocketDemo extends SimpleWebSocketListener implements SubProtocolCapable{
    @Override
    public void onMessage(WebSocket socket, String text) throws IOException {
        socket.send("我收到了：" + text);
    }
    
    @Override
    public String getSubProtocols(Collection<String> requestProtocols) {
        //子协议能力声明
        return "stomp";
    }
}
```

也可以对 requestProtocols 做校验，实现动态子协议支持