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Validation and Swagger/OpenAPI have been available for a long time and well documented. I don't know what resources you used to learn ASP.NET, but they failed you.

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Looks like I was using the wrong ASP.NET features! Route-to-code does not support OpenAPI.

https://docs.microsoft.com/en-us/aspnet/core/web-api/route-t...

All the way back to .NET Framework 4.5 at very least (2012).

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