This is Perl module Plack::Handler::CLI.
INSTALLATION
Plack::Handler::CLI installation is straightforward. If your CPAN shell is set up,
you should just be able to do
$ cpan Plack::Handler::CLI
Download it, unpack it, then build it as per the usual:
$ perl Makefile.PL
$ make && make test
Then install it:
$ make install
DOCUMENTATION
Plack::Handler::CLI documentation is available as in POD. So you can do:
$ perldoc Plack::Handler::CLI
to read the documentation online with your favorite pager.
Goro Fuji (gfx)