internal package Foswiki::EngineException is a Error status - status code to send to client
reason a text string giving the reason for the refusal.
ClassMethod new( $status, $reason [, $response] ) $status - status code to send to client
$reason - string reason for failure
$response - custom Foswiki::Response object to be sent to client. Optional.
$e->{status} and $e->{reason}
ObjectMethod stringify() → $string