in reply to How do i save an image with www::mechanize

My guess is: this is because you're not sending a Referer(*) header, whereas the browser is. Try:

$mech->add_header( Referer => '<url of page that embeds captcha>' );
$mech->get( ...

[download]

(*): not a typo, see RFC 2616

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whether it be to cleaning windows
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In Section Seekers of Perl Wisdom