I can replicate. It appears to be a misused error code. There's no telling what the server is trying to communicate. It could be an attempt at rejecting robots. It could be a bug in the server.

In reply to Re^5: WWW::Mechanize: 416-Requested Range Not Satisfiable by ikegami
in thread WWW::Mechanize: 416-Requested Range Not Satisfiable by gontham

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