Re Safari’s networking code being closed source, a good substitute might be the Swift port of Foundation. You can see checks for control and delete characters h

Re Safari’s networking code being closed source, a good substitute might be the Swift port of Foundation. You can see checks for control and delete characters here: https://github.com/swiftlang/swift-corelibs-foundation/blob/c28bf23e18e217709dddd5c2c1b3ee1f2a4151cb/Sources/FoundationNetworking/HTTPCookie.swift#L790 https://github.com/swiftlang/swift-corelibs-foundation/blob/...