This is Perl module HTTP::UserAgentClientHints.
HTTP::UserAgentClientHints installation is straightforward. If your CPAN shell is set up, you should just be able to do
% cpan HTTP::UserAgentClientHints
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
HTTP::UserAgentClientHints documentation is available as in POD. So you can do:
% perldoc HTTP::UserAgentClientHints
HTTP::UserAgentClientHints is hosted on github: http://github.com/bayashi/HTTP-UserAgentClientHints
HTTP::UserAgentClientHints is free software; you can redistribute it and/or modify it under the terms of the Artistic License 2.0. (Note that, unlike the Artistic License 1.0, version 2.0 is GPL compatible by itself, hence there is no benefit to having an Artistic 2.0 / GPL disjunction.) See the file LICENSE for details.
Dai Okabayashi < bayashi at cpan.org >