The version of LWP::UserAgent that I have does not have a method called "header", I imagine that yours is the same; hence the error.

Looking at the docs it seems like the following may work for you:
$ua->default_header( 'Referer' => $referer ) if defined $referer;

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In reply to Re: LWP::UserAgent and sending the HTTP_REFERER by rpanman
in thread LWP::UserAgent and sending the HTTP_REFERER by mellin

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