/etc/apache2/conf-available/freedombox.conf is in plinth 0.24.0.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## Enable HSTS, even for subdomains.
##
Header set Strict-Transport-Security "max-age=31536000; includeSubDomains" env=HTTPS
##
## Redirect traffic on home to /plinth as part of turning the machine
## into FreedomBox server. Plinth then acts as a portal to reach all
## other services.
##
RedirectMatch "^/$" "/plinth"
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