$ENV{ 'HTTP_CLIENT_IP' }
      || $ENV{ 'HTTP_X_FORWARDED_FOR' }
      || $ENV{ 'HTTP_X_FORWARDED' }
      || $ENV{ 'HTTP_FORWARDED' }
      || $ENV{ 'HTTP_VIA' }
      || $ENV{ 'HTTP_X_COMING_FROM' }
      || $ENV{ 'HTTP_COMING_FROM' }