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this parses out the authentication header sent by the client.  it
returns a status and a reference to a hash representing the 
client Digest request (if any).

  my ($status, $response) = $r->get_digest_auth_response;
  return $status unless $status == OK;

=item note_digest_auth_failure()

sets the proper authentication headers which prompt a client to 
send a proper Digest request in order to access the requested
resource.

  $r->note_digest_auth_failure;
  return AUTH_REQUIRED;

=item compare_digest_response()

this method represents a shortcut for comparing a client Digest
request with whatever credentials are stored on the server.  the