This is Perl module CGI::Header::PSGI.
INSTALLATION
CGI::Header::PSGI installation is straightforward.
If your CPAN shell is set up, you should just be able to do
% cpan CGI::Header::PSGI
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
DOCUMENTATION
CGI::Header::PSGI documentation is available as in POD.
So you can do:
% perldoc CGI::Header::PSGI
to read the documentation online with your favorite pager.
Ryo Anazawa