WebSockets in ASP.NET Core are easy to use but due to the simple model it's easy to forget that socket requests are long lived and can linger for a long time in the background and that can cause problems when an application needs to shut down cleanly. Luckily there's an IHostApplicationLifetime interface available that allows hooking shutdown operations and that provides the necessary cancellation tokens to allow an WebSocket connection to be terminated in response to a shutdown event. This…

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