[Webkit-unassigned] [Bug 259743] New: iCloud Private Relay causing websockets to close after several minutes on 16.4+

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259743

            Bug ID: 259743
           Summary: iCloud Private Relay causing websockets to close after
                    several minutes on 16.4+
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: michael.whittemore at vonage.com

When using iCloud Private Relay on Safari iOS 16.4+ and iOS 17 beta (we’re not sure which version introduced this regression), websocket connections close with code 1006 after several minutes. This can be reproduced consistently with the following steps: 

1. Enable iCloud relay & disable any VPNs on your iOS device.
2. Set up a simple websocket server that allows a connection and logs when a connection has been closed. In our case, we used the node websocket module (https://www.npmjs.com/package/ws) and made it available via the ngrok reverse proxy. Here’s a jist with the server-side code(https://gist.github.com/cpettet/f8fbbb071a7dbf48e5dc69fe2c7cbda8).
3. Fork the following JS fiddle and change the URI to target your server https://jsfiddle.net/michaelwhittemore/0wLpzt9b/.
4. Open the JS fiddle on your iOS device with the private relay. Observe that the socket closes after five to six minutes. This should be consistently reproducible. 

>From what we’ve seen, it’s not related to connections being stale, as even a message sent every 30s or 1s does not keep the WebSocket open.We suspect this may be related to the changing IP address in the private relay implementation.

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