Reading the docs for HTTP::Headers I see this telling entry:
$h->title The title of the document. In libwww-perl this header will be initialized automatically from the <TITLE>...</TITLE> element of HTML documents. This header is no longer part of the HTTP standard.
I'm guessing the last sentence may be a key to understanding why these things are here. It might also be that many people just find them useful enough to want them as pseudo-headers.

Phil

Update: Fixed poor grammar.

In reply to Re: Using LWP::UserAgent for http post... Abnormal headers returned by philcrow
in thread Using LWP::UserAgent for http post... Abnormal headers returned by vancetech

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