See this section of the Mason documentation.

Perhaps semething like this: 

<%perl>
$m->autoflush(0);
$m->clear_buffer();
$r->header_out->add("WWW-Authenticate" => 'Basic realm="RealmChain"');
$r->send_http_header();
$m->abort("401 Unauthorized");
</%perl>

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

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