There is an ongoing outage on the primary CPAN mirror. It is possible to work around the issue by using MetaCPAN as a mirror.
To install WWW::FCM::HTTP::V1, copy and paste the appropriate command in to your terminal.
cpanm
cpanm WWW::FCM::HTTP::V1
CPAN shell
perl -MCPAN -e shell install WWW::FCM::HTTP::V1
For more information on module installation, please visit the detailed CPAN module installation guide.