When HTTP Basic auth is enabled and credentials are absent or rejected,
nginx serves a Catppuccin-styled 401 page that tells the operator which
hivectl command to run to create a user. Uses error_page 401 =401 so
the browser still receives a 401 status (login dialog fires on first
visit) while getting a human-readable body when the dialog is dismissed.
The exact-match location (= /__hive_auth_unauthorized) beats location /
in nginx's prefix ordering so the internal subrequest does not loop back
through auth_basic.
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