Allow subclasses to override the class of parts - it used to be
hardcoded to HTTP::Message. (Gisle Aas, RT#79239)Added support for is_client_error, is_server_error to HTTP::Response
(Karen Etheridge)Added flatten interface to HTTP::Headers (Tokuhiro Matsuno, GH#5)
Allow PUT to pass content data via hashrefs just like with POST (Michael
Schilli, GH#9)Fix for "Content-Encoding: none" header (Gisle Aas, RT#94882)
Add support for HTTP status 308, defined in RFC 7238 (Olivier Mengué,
RT#104102)drop the use of "use vars" (Karen Etheridge)