Authorization required: sitemap.xml
Verification word: straw

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InN0cmF3IiwianRpIjoiYjE1ODEyNjJmODZiNDBmNDhjYWJiNzY2MjFhNmE1ZWIiLCJpc3MiOiJzZXJ2ZXMuY2sxLm1lIiwiYXVkIjoiYXV0aC5jazEubWUiLCJpYXQiOjE3ODQ1NjIzMDIsImV4cCI6MTc4NDU2MjYwMn0._nkFPrlx_dxXPhfzn1U3CN50l92uuI-IVIu0v1ZwJxc

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InN0cmF3IiwianRpIjoiYjE1ODEyNjJmODZiNDBmNDhjYWJiNzY2MjFhNmE1ZWIiLCJpc3MiOiJzZXJ2ZXMuY2sxLm1lIiwiYXVkIjoiYXV0aC5jazEubWUiLCJpYXQiOjE3ODQ1NjIzMDIsImV4cCI6MTc4NDU2MjYwMn0._nkFPrlx_dxXPhfzn1U3CN50l92uuI-IVIu0v1ZwJxc' -o 'sitemap.xml'