I would like to announce that the first version of the Perl client has been released and pushed to the CPAN.
you can found the tagged version on github [1].
The client is compatible with the current specification and come with a list of usable middlewares:
* format::json
* format::yaml
* format::xml
* auth::basic
* auth::oauth
and some more.
The module should be avaible soon on your favorite mirror.