The file /usr/share/doc/cups-daemon/README.Debian.gz claims that cups
can be configured via its web interface and that further documentation
can be found through the web interface:

However, this interface is only accessible if the cups package (which
provides files /usr/lib/cups/cgi-bin/*) is installed. Please consider
updating README.Debian to specify that users need to install the cups
package to administer cups-daemon via the web interface.

Best wishes,
Ryan