How to protect file from public access in Drupal 8?

If we don't want to show any file or folder to 'Anonymous user', 'Authenticated user' then we have 2 options.

1. We can set the 'Permission' for this file or folder.

2. If we are using Pantheon server then we have 'pantheon.yml' file on root.

Write the code there.

protected_web_paths:

  - /web.config

  - /core/package.json

And this way easily we can protect our file or folder from unknown users.

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