做了个 WebSocket 连接，客户端通过定时发送心跳。但是时间一长发现还是会自动断开，心跳时间是 30s 一次，ng 也做了如下配置：

proxy-read-timeout：'3600'
proxy-send-timeout：'3600'

有没有大佬出现过这种情况？ 错误如下：

 java.io.EOFException: null

 	at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1345)

 	at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.read(NioEndpoint.java:1255)

 	at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:75)

 	at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:183)

 	at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:162)

 	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:156)

 	at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:60)

 	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:59)

 	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)

 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1707)

 	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)

 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)

 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

 	at java.base/java.lang.Thread.run(Thread.java:829)