tells what went wrong.
see error-documents-howto.doc
the vector has 3 elements. element 0 is the standard http error code, element 1 is the bs additional code, element 2 is for for additional information, if used at all. it is an array (hash or vector) and it may be empty. example: array(410, 1, array('datetime')); would mean that the page expired on 'datetime' and thus is gone.
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