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Breaking changes in ASP.NET Core 9

aspnetcore/breaking-changes/9/overview.md

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Breaking changes in ASP.NET Core 9

If you're migrating an app to ASP.NET Core 9, the breaking changes listed here might affect you.

[!INCLUDE binary-source-behavioral]

TitleType of change
DefaultKeyResolution.ShouldGenerateNewKey altered meaningBehavioral change
Dev cert export no longer creates folderBehavioral change
Forwarded Headers Middleware ignores X-Forwarded-* headers from unknown proxiesBehavioral change
HostBuilder enables ValidateOnBuild/ValidateScopes in development environmentBehavioral change
Legacy Mono and Emscripten APIs not exported to global namespaceSource incompatible
Middleware types with multiple constructorsBehavioral change