nostr:nprofile1qqs24yz8xftq8kkdf7q5yzf4v7tn2ek78v0zp2y427mj3sa7f34ggjccd5eyg does the client learn which hosts need auth from an initial 401, or keep a maintained list so a brand new host still signs correctly the first try? that's the edge case preemptive doesn't fully cover.