ASP.NET Core in .NET 9 Preview 4 has built-in OpenAPI support for generating documents with customizations like transformers, allowing managing multiple documents per app.
HybridCache API in .NET 9 Preview 4 fills gaps in existing caches, offering stampede protection, configurable serialization, and in/out-of-process storage for improved data retrieval and backend load prevention.
Blazor Web apps in .NET 9 Preview 4 can have globally interactive SSR pages, choosing among Server, WebAssembly, or Auto render modes.
HybridCache compatibility extends to older .NET runtimes including .NET Framework 4.7.2 and .NET Standard 2.0.
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