pkg\sky_engine\lib\_http\websocket.dart
/// A ping message is sent every [pingInterval], starting at the first
/// [pingInterval] after a new value has been assigned or a pong message has
/// been received. If a ping message is not answered by a pong message from the
/// peer, the `WebSocket` is assumed disconnected and the connection is closed
/// with a [WebSocketStatus.goingAway] close code. When a ping signal is sent,
/// the pong message must be received within [pingInterval].
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标签：ping,been,sent,pingInterval,pong,message,收不到 From： https://www.cnblogs.com/papering/p/17657953.html