Nice article
tldr;
You can use Fallback Policies in ASP.NET Core 3.0+ to require an Authenticated User by default. Conceptually, you can think of this as adding an [Authorize] attribute by default to every single Controller and Razor Page ONLY WHEN no other attribute is specified on a Controller or Razor Page (like [AllowAnonymous] or [Authorize(PolicyName="PolicyName")]). See lines 9-11 below.
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| publicclassStartup |
| { |
| // Other Startup code omitted |
| publicvoidConfigureServices(IServiceCollectionservices) |
| { |
| services.AddAuthorization(options => |
| { |
| options.FallbackPolicy =new AuthorizationPolicyBuilder() |
| .RequireAuthenticatedUser() |
| .Build(); |
| // Register other policies here |
| }); |
| // Other service… |
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Neel Bhatt 
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