Authorization required: sitemap.xml
Verification word: endless

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImVuZGxlc3MiLCJqdGkiOiI0YmI5YjIzMmU4Zjk0NzU0YTlkNjQ3ZTRhNTU5MGNhNSIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4NDMzNTg5MCwiZXhwIjoxNzg0MzM2MTkwfQ.O0ZB2GqtD6ORrZnqZjLTEuA2N19JPzeM8p67cID_ND8

(No browser on this box? Cmd-click that link to open it on your laptop;
 it shows a QR you can scan with your phone.)

Then fetch the file -- this command waits until you approve:
  curl -fL 'https://serves.ck1.me/sitemap.xml?grant=eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImVuZGxlc3MiLCJqdGkiOiI0YmI5YjIzMmU4Zjk0NzU0YTlkNjQ3ZTRhNTU5MGNhNSIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4NDMzNTg5MCwiZXhwIjoxNzg0MzM2MTkwfQ.O0ZB2GqtD6ORrZnqZjLTEuA2N19JPzeM8p67cID_ND8' -o 'sitemap.xml'