Like web apps, the ASP.NET and ASP.NET Core web APIs are protected because their controller actions are prefixed with the [Authorize] attribute. The controller actions can be called only if the API is called with an authorized identity.
Consider the following questions:
- Only an app can call a web API. How does the API know the identity of the app that calls it?
- If the app calls the API on behalf of a user, what’s the user’s identity?
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