[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

Mikael Nousiainen <tmnousia at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |tmnousia at gmail.com

--- Comment #18 from Mikael Nousiainen <tmnousia at gmail.com> ---
I've encountered this issue too with a WebSocket server using HTTP/2 + TLS 1.3. The connection succeeds at first and I'm able to send and receive some (short) WebSocket messages, but then the connection gets disconnected with the aforementioned "kNWErrorDomainPOSIX error 100 - Protocol error" error message. A longer message sent by the server seems to cause the disconnection.

Based on the discussion in this thread:
https://developer.apple.com/forums/thread/685403

I'm also suspecting that the reason might be what is described there:

"This error is caused by NSURLSession’s inability to process split messages normally. As long as the received WebSocket Message Frame is Fin=0, an error will occur."

There seems to be a workaround for this:

1. Navigate to: Settings > Safari > Advanced > Experimental Features
2. Set "NSURLSession WebSocket" to OFF and restart Safari (or the phone/tablet). This seems to fix the issue for now at least.

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