Use this little website to test if a URL is setup correctly to work with CORS.
Shareable link: https://cors-test.codehappy.dev/?url=https%3A%2F%2Fplanet.openstreetmap.org%2Freplication%2Fchangesets%2Fstate.yaml
These are the response headers received when making the request.
accept-ranges: bytes
access-control-allow-methods: GET
access-control-allow-origin: *
access-control-max-age: 3600
cf-cache-status: DYNAMIC
cf-ray: 95a98aaf0340e818-ORD
connection: keep-alive
content-length: 69
content-type: binary/octet-stream
date: Sat, 05 Jul 2025 20:16:43 GMT
etag: "93c2135e6bfee4e0890d8c174a362441"
last-modified: Sat, 05 Jul 2025 20:16:41 GMT
server: cloudflare
vary: Origin, Access-Control-Request-Headers, Access-Control-Request-Method
x-amz-id-2: KAFxZYtS8+upA9Y+3/vcaGrfqBwA3rlWWz1EL2Uf5O12F+N7NqkKoPDXXueSY7OELZp5fKX/AxhIil72fKZTV5TqtMtba1UX
x-amz-replication-status: PENDING
x-amz-request-id: HSR77S61JA53SQBB
x-amz-server-side-encryption: AES256
x-amz-storage-class: INTELLIGENT_TIERING
x-amz-version-id: TMIH0fLmFdOlWRf_E4ZkgOBgdNiigXjx
CORS tester was built by @mscccc. The code is available on GitHub. Sponsored by HTML/CSS to Image.