Vaadin 24.4.12 @Push and iOS18 Problem

[janarbis]

Description of the bug

Since the new iOS18 Update on iPhone we get the following Warning when using push():
WARN com.vaadin.flow.server.communication.ServerRpcHandler -- Resynchronizing UI by client's request. A network message was lost before reaching the client and the client is reloading the full UI state. This typically happens because of a bad network connection with packet loss or because of some part of the network infrastructure (load balancer, proxy) terminating a push (websocket or long-polling) connection. If you are using push with a proxy, make sure the push timeout is set to be smaller than the proxy connection timeout
wich leads into a white screen. The App needs to be refreshed after that.

In my dev machine I only use tomcat 10, no vpn, no loadbalancer or similar. The Connection is stable as well.
The problem only occures if i use the ssl connector of the tomcat. With HTTP their is no problem, but this is not the solution.

Expected behavior

No Warning

Minimal reproducible example

We use the @Push annotation at our main route. The problem occures if we want to update the UI from an backround task with
UI.getCurrent().access(() -> { UI.getCurrent().push() });

Versions

• Vaadin / Flow version: 24.4.12
• Java version: 17
• OS version: iOS18 (iPhone)
• Browser version: Safari
• Application Server: Tomcat 10
• IDE: Eclipse

[janarbis]

Maybe this small example helps you to investigate the problem:

@Viewport("width=device-width, initial-scale=1, maximum-scale=1")
@Push(PushMode.MANUAL) 
public class PushTestAppShellConfigurator implements AppShellConfigurator {
}

@Route("")
public class PushTestView extends Div {

	private VerticalLayout vl;

	public PushTestView() {
		vl = new VerticalLayout();
		NativeButton button = new NativeButton("Add labels via push",
				event -> addLabel());
//				event -> new Thread(this::addLabel).start());
		add(button, vl);
	}

	private void addLabel() {
		long threadId = Thread.currentThread().getId();
//		getUI().ifPresent(ui -> ui.access(() -> {
		UI.getCurrent().access(() -> {
			
			vl.removeAll();
			for (int i = 0; i < 10; i++) {
				vl.add(new NativeLabel("Label " + i + " added via push by thread " + threadId));
//				ui.push();
				UI.getCurrent().push();
			}
		});
//		}));
//		Thread.currentThread().interrupt();
	}
}

If you press the Button on iPhone (iOs18) multiple times the problem will occures.
I also get the following error when putting the app in background:

11:49:04.887 [https-openssl-nio-8443-exec-7] DEBUG org.atmosphere.container.JSR356Endpoint -- Problem in web socket session
java.net.SocketException: Connection reset
	at java.base/sun.nio.ch.SocketChannelImpl.throwConnectionReset(SocketChannelImpl.java:394)
	at java.base/sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:426)
	at org.apache.tomcat.util.net.SecureNioChannel.read(SecureNioChannel.java:601)
	at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1294)
	at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1247)
	at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.read(NioEndpoint.java:1191)
	at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:74)
	at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:184)
	at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:164)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:152)
	at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:60)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:57)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$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:833)