https://learn.microsoft.com/tr-tr/dotnet/api/system.web.websockets.aspnetwebsocket.closeoutputasync?view=netframework-4.8.1
AspNetWebSocket.CloseOutputAsync Method (System.Web.WebSockets) | Microsoft Learn
Sends an asynchronous message to a client to close the connection. If the server initiates the request to close the connection, the method returns without...
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