通过使用$server->connection_info($fd)获取连接信息，返回的数组中有一项为 websocket_status，根据此状态可以判断是否为WebSocket客户端。
- WEBSOCKET_STATUS_CONNECTION = 1，连接进入等待握手
- WEBSOCKET_STATUS_HANDSHAKE = 2，正在握手
- WEBSOCKET_STATUS_FRAME = 3，已握手成功等待浏览器发送数据帧
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