The output from https://www.cloudflare.com/ips-v4/ is cached incorrectly in POPs near Toronto:
○ → curl -i https://www.cloudflare.com/ips-v4/
HTTP/2 200
date: Fri, 23 Dec 2022 17:47:38 GMT
content-type: text/plain;charset=UTF-8
content-length: 0
cf-ray: 77e2ec6c5d685419-YYZ
accept-ranges: bytes
age: 64038
cache-control: max-age=86400
expires: Sat, 24 Dec 2022 00:00:20 GMT
last-modified: Fri, 23 Dec 2022 00:00:20 GMT
vary: Accept-Encoding
cf-cache-status: HIT
set-cookie: __cf_bm=4MSp_FwZZMpTaRQGgH9DUqKpEImt3lYRmth3mZFR87o-1671817658-0-AUAHpwVsOmAFpyew6EXazr6/LGkrm6EC/Xp6hVyUJ/B6Uk1rDnMnsqdS9N9azevrTKmGPfnO1RebAyLDR7hcM3AMOaFTgl2u1bf8ktQgdi22; path=/; expires=Fri, 23-Dec-22 18:17:38 GMT; domain=.www.cloudflare.com; HttpOnly; Secure; SameSite=None
server-timing: cf-q-config;dur=8.999999408843e-06
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=jxs4CbLSHtMHUJQ%2BHAFpD3qOV6O8Ahy4XXJ8IPtbLh4HBrHuC7D2T01AlwPZEZKMIrLBjwguSkdKH0TySOHKtF2JMHx6LK08kkW%2BtY2lvYNHXgmQwVWy%2Fmrbj%2FJgUFaTy8XRqWrsH1zwt1pOcWjMjA%3D%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
server: cloudflare
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400
… there should be a list of IPs here.
Interestingly, the HEAD response shows the expected length:
○ → curl -I https://www.cloudflare.com/ips-v4/
HTTP/2 200
date: Fri, 23 Dec 2022 17:51:18 GMT
content-type: text/plain;charset=UTF-8
content-length: 230
cf-ray: 77e2f1c98f1d6308-ORD
accept-ranges: bytes
age: 64834
cache-control: max-age=120
last-modified: Thu, 22 Dec 2022 23:50:44 GMT
strict-transport-security: max-age=31536000
vary: Accept-Encoding
cf-cache-status: HIT
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
set-cookie: __cf_bm=BpywFlYtgGXGJM3Y7CENALjlPwxD7T08phWVrMh0nUE-1671817878-0-AUOjkvg0aTvWv2DtNSVGNZlPebVJjpAZ+aLcO3IOToTsYTt8cllLMDYx4A8VX+MXBmDKkGUxWIhMwE1kE8GyC8kvykZ9J5bx7gitf6Xqx3Mv; path=/; expires=Fri, 23-Dec-22 18:21:18 GMT; domain=.www.cloudflare.com; HttpOnly; Secure; SameSite=None
server-timing: cf-q-config;dur=7.9999999798019e-06
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=RjhGuhZhEPRID9rUV3mZvPRTquSaWs8w1Ghl3FzcwFT0qdQwpZSdGY5BLjbrhkZDERSjczal%2FKJLCC3kplQp5yn6TirzuJrdXgnnnW6mLFXwDso1dBlpuRl7VJ%2BPa5mBxRfqmxrN%2FS9uojg5em9CFg%3D%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
server: cloudflare
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400