There's effort to define standard behavior here. See https://wicg.github.io/private-network-access/ https://wicg.github.io/private-network-access/ (although I s

There's effort to define standard behavior here. See https://wicg.github.io/private-network-access/ https://wicg.github.io/private-network-access/ (although I suspect this document may make a significant shift soon)