[Webkit-unassigned] [Bug 228296] REGRESSION (iOS 15): Websocket connection instance in javascript client getting closed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228296

Jorge Manrubia <jorge at hey.com> changed:

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                 CC|                            |jorge at hey.com

--- Comment #25 from Jorge Manrubia <jorge at hey.com> ---
I could reproduce the problem exactly as described by Matt Windwer in https://bugs.webkit.org/show_bug.cgi?id=228296#c22.

We have been experiencing this bug in our Basecamp iOS app since the upgrade to iOS 15: when opening a chats and trying to send a message, it would sometimes fail to deliver it. We got several reports from customers about this.

The cause is that the underlying web sockets fail to connect with the same error:

> [Error] WebSocket connection to 'wss://xxx' failed: WebSocket is closed before the connection is established.

1. It happens intermittently when restoring the app from the background.
2. The only way to fix is restarting the app. The app embeds a WKWebView instance, and reloading the page there won't fix the problem.

   I tried to debug the problem with Safari dev tools, with my unit plugged, and closing the web sockets and creating new ones from the console wouldn't fix the problem either.

3. Disconnecting the wifi, trying to send a message, and connecting it again fixed the issue.

Today, I was able to also reproduce the problem with Safari Technology Preview release 135 (macOS Monterey):

1. Open a campfire in Basecamp (you can create a free account in https://basecamp.com)
2. Put the computer to sleep.
3. Wait for like 15 minutes (you need to give it some time to happen, it won't fail if you wake up the computer right away).
4. Come back and try to send a message, you will see exactly the same problem described by Matt and shown in his screencast. I'm attaching an screenshot.

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