This doesn't seem to work. Although abort() forced the correct status (401), it somehow removed the WWW-Authenticate header: 
$r->header_out->add("WWW-Authenticate" => 'Basic realm="RealmChain"');
$r->send_http_header();

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In reply to Re^2: [Mason] Sending right header to force http basic authentication by johnnywang
in thread [Mason] Sending right header to force http basic authentication by jeteve

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