The response is signed by Apple, and presumably (!) your Mac is validating that signature correctly. I haven't checked if they are using stapling, but that woul

The response is signed by Apple, and presumably (!) your Mac is validating that signature correctly. I haven't checked if they are using stapling, but that would be the sensible way to do it, in which case it is a server side parameter (though possibility with client side limits too, but you'd need to disassemble the binary).