AsyncSequence from URLSessionWebSocketTask?

eskimo · October 29, 2025, 8:43am

does Apple actually provide a readily available WebSocket connection?

Yes. It’s very easy to set up if you’re using the latest API:

let connection = NetworkConnection(to: endpoint) {
    WebSocket {
        TLS()   // or TCP()
    }
}

See WWDC 2025 Session 250 Use structured concurrency with Network framework for more about that API.

With the original NWConnection API it requires a bit more ceremony. See this forums post. Oh, and that thread also has code for the original Network framework C API.

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Quinn “The Eskimo!” @ DTS @ Apple