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
[Authorize(PolicyName="PolicyName")]). See lines 9-11 below.
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|// Other Startup code omitted|
|// Register other policies here|
|// Other service registrations omitted|
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