.NET 9 Release Candidate 1: Approaching Final Release with Updates Across the Framework
Briefly

The introduction of new APIs in .NET 9 offers developers improved configuration options for WebSocket connections, enhancing responsiveness and connection management in network applications.
With new compression options and features for managing TAR archives, .NET 9 provides developers greater control and efficiency, essential for working with large data files.
The dotnet workload history command simplifies management of .NET SDK installations, allowing users to track changes in workload versions, akin to Git's reflog.
ASP.NET Core’s enhancements aim to boost performance and security with features like keep-alive timeouts for WebSockets and improved SignalR tracing, streamlining development processes.
Read at InfoQ
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