一、问题

websocket 服务使用 Nginx 反向代理后，发现会自动断开，查看日志如下

2024-02-22 18:51:05:964 1901020240223104709130 [ERROR] websocket连接错误,
java.io.EOFException: null
        at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1339)
        at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.read(NioEndpoint.java:1226)
        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:157)
        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$ConnectionHandler.process(AbstractProtocol.java:890)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.base/java.lang.Thread.run(Thread.java:842)

二、原因

使用了 Nginx 反向代理后，超过 60 秒没有数据传输的连接会自动断开。

三、解决方法

1. 修改 nginx 配置

proxy_read_timeout 3600;

将超时时间改长一点

2. 前端或者后端加个定时任务发个心跳包就好了，例如：

//定时任务，由于使用nginx反向代理，60秒无数据传输会断开
timer=setInterval(function() {
	if (websocket.readyState == 1) {
		websocket.send("心跳包检测");
	} else {
		//IM连接已断开
	}
}, 50 * 1000);

我两种方法都用了， 首先将超时时间改成了一小时。 然后让前端每半小时给后台发送一次心跳，后台响应心跳。