It's very easy to setup asynchronous validation in Angular Form. You can check wheather provided email/date/name etc. already exists in the server with a HTTP call.
If you are adding API versioning to your existing API project, you can tell ASP.NET Core to treat the undercoated controllers and actions to have version 1.0 by default. To do that, configure the AddApiVersioning() service with AssumeDefaultVersionNumberUnspecified flag.
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