• Requiring Net::HTTP 6.07 to fix IPv6 support (RT#75618 and
  https://github.com/libwww-perl/net-http/pull/10)
  
• When the hostname is an IPv6 literal, encapsulate it with [brackets]
  before calling Net::HTTP [rt.cpan.org #29468]
  
• Extra steps to make sure that the host address that has a ":" contains
  only characters appropriate for an IPv6 address.
  
• Fix doc typo for cookie_jar