Header directive is not mutually exclusive

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defer does work, but I need to switch the order (probably related to “Can't get simple alias to work - #9 by matt”, and may have been fixed).

  route {
    header /libs/* {
      Cache-Control "public, max-age=31536000, immutable"
      defer
    }
    header {
      -server
      Cache-Control "max-age=604800, public"
      defer
    }
  }

I also tried comment out the -server and it still works. Removing route also works and regardless of header order.