ASP.NET Core 9 RC 1: Keep-alive Timeouts for Websockets, Improved SignalR Tracing, and More
Briefly

With the introduction of keep-alive timeouts in WebSockets, Microsoft addresses a significant issue across platforms, updating ClientWebSocketOptions for improved connection handling and pings.
The inclusion of Keyed DI services enhances flexibility in Dependency Injection by allowing developers to register and resolve services using designated keys, improving the developer experience.
Read at InfoQ
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