Mac is calling unsecure ipp Validate-Job if Airprint.air=username,password

[Prochy]

Hi,

I'm facing an issue and I'm not sure if it's by IPP specification or not, so I just need to confirm it.

If I publish via Bonjour a printer with settings: Air = username, password, mac/iphone tries contacting first plain ipp Validate-Job request and if it's success then switch to secure ipps Get-Printer-Attributes. If Air = none, Validate-Job request is skipped and it calls Get-Printer-Attributes request. (Tls is set to 1.2 in TXT record)

Is this by a specification and if so by which one? I would suppose that if there is TXT _ipps._tcp,_universal, the apple will never contact unsecure endpoint?

Thank you for the clarification