So does LWP::UserAgent. The only difference is that WWW::Mechanize provides these aliases:
'Windows IE 6' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5. +1)', 'Windows Mozilla' => 'Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; +rv:1.4b) Gecko/20030516 Mozilla Firebird/0.6', 'Mac Safari' => 'Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) +AppleWebKit/85 (KHTML, like Gecko) Safari/85', 'Mozilla' => 'Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; +en-US; rv:1.4a) Gecko/20030401', 'Linux Mozilla' => 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) +Gecko/20030624', 'Linux Konqueror' => 'Mozilla/5.0 (compatible; Konqueror/3; Linux)',

In reply to Re^2: LWP::UserAgent gets 403 when other browser does not by ikegami
in thread LWP::UserAgent gets 403 when other browser does not by pileofrogs

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