Authorization required: sitemap.xml
Verification word: gush

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6Imd1c2giLCJqdGkiOiIzMmNhNGYxYTM5ZDA0YTY4YTgzMTk2N2I4ZmM2YjA4MyIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4MzA1MDU3MiwiZXhwIjoxNzgzMDUwODcyfQ.BVQG7HTVAJZbLS3L8vfti7XL9OQVuJ4nSaZWfBM_TbA

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6Imd1c2giLCJqdGkiOiIzMmNhNGYxYTM5ZDA0YTY4YTgzMTk2N2I4ZmM2YjA4MyIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4MzA1MDU3MiwiZXhwIjoxNzgzMDUwODcyfQ.BVQG7HTVAJZbLS3L8vfti7XL9OQVuJ4nSaZWfBM_TbA' -o 'sitemap.xml'