Authorization required: sitemap.xml
Verification word: cargo

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImNhcmdvIiwianRpIjoiMmQ3NTMzNmRkYWVjNDI4ZGIyMzcwYzk3NjJmNzQzM2YiLCJpc3MiOiJzZXJ2ZXMuY2sxLm1lIiwiYXVkIjoiYXV0aC5jazEubWUiLCJpYXQiOjE3ODQwNjY4NzEsImV4cCI6MTc4NDA2NzE3MX0.yk_5HyXY1-51UqSY3y4x3UQ6ndXGTqubDigeCfrg8eo

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImNhcmdvIiwianRpIjoiMmQ3NTMzNmRkYWVjNDI4ZGIyMzcwYzk3NjJmNzQzM2YiLCJpc3MiOiJzZXJ2ZXMuY2sxLm1lIiwiYXVkIjoiYXV0aC5jazEubWUiLCJpYXQiOjE3ODQwNjY4NzEsImV4cCI6MTc4NDA2NzE3MX0.yk_5HyXY1-51UqSY3y4x3UQ6ndXGTqubDigeCfrg8eo' -o 'sitemap.xml'