The client.conf file configures the CUPS client and is
normally located in the /etc/cups or ~/.cups
directory. Each line in the file can be a configuration
directive, a blank line, or a comment. Comment lines start with
the # character.
DIRECTIVES
The following directives are understood by the client. Consult the
on-line help for detailed descriptions:
Encryption IfRequested
Encryption Never
Encryption Required
Specifies the level of encryption that is required for a particular
location.
ServerName hostname-or-ip-address[:port]
ServerName /domain/socket
Specifies the address and optionally the port to use when
connecting to the server