https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.webapicompatshim.usewebapiroutesattribute?view=aspnetcore-2.2
UseWebApiRoutesAttribute Class (Microsoft.AspNetCore.Mvc.WebApiCompatShim) | Microsoft Learn
Indicates the controller is in the "api" area.
classmicrosoftaspnetcoremvclearn