[apenwarr]

However, the preflight check is sufficient to check latency :)

"Preflight check" is such a wrong analogy, since with CORS you fly all the way to the destination to check if you're allowed to fly to the destination.

[other_herbert]

It’s more of a cargo check, you fly all the way there to see if they’ll let you take some cargo back with you

*cargo isn’t really the right analogy… but close enough

[jrockway]

Customs check basically. If you aren't allowed to bring something into the country you land in, they simply confiscate it when you get there. (And I'm sure arrest you and make you miserable because ... that's what justice is I guess.)