dmzen,
HTTP::Lite claims to have a toggle option for HTTP 1.1 support - it is off by default.

Cheers - L~R

Update: HTTP::MHTTP also has some 1.1 support, but probably doesn't have everything you are after.
I found this web site that shows the latest attempt at adding 1.1 support and can be downloaded here
You might have to splice things together. - L~R