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IIUC, before using the translator handler, the ping data can be delivered from the client to the runtime side since kube-apiserver does not parse any client data. However, with WebSocket, the server responds with a pong to the client without forwarding the data to the runtime side. If a proxy is present, it may close the connection due to inactivity. SPDY's PingPeriod can help address this issue. Signed-off-by: Wei Fu <fuweid89@gmail.com> Co-authored-by: Antonio Ojea <aojea@google.com>