pablobm left a comment (openstreetmap/openstreetmap-website#6595)
I'm seeing the same as @tomhughes:
<img width="1371" height="616" alt="Firefox network inspector, showing a CORS
error when trying to fetch
https://vector.openstreetmap.org/styles/shortbread/colorful.json";
src="https://github.com/user-attachments/assets/7c424753-b684-4982-8d5c-8008bf08cd85";
/>
Confusingly, sometimes the Firefox network inspector shows the error, and
sometimes it doesn't, loads the data from cache, and pretends that all is ok,
but the map still doesn't load (it's completely blank). All I see in the
console is two CSP warnings that I think are unrelated.
My recollection of how CORS works is sketchy, but I can't see any
`Access-Control-*` headers?
```
$ curl --silent -i
https://vector.openstreetmap.org/styles/shortbread/colorful.json | head -n 50
HTTP/2 200
server: nginx
content-type: application/json
last-modified: Sun, 07 Dec 2025 22:15:43 GMT
etag: "6935fc8f-4a18d"
cache-control:
public,max-age=300,stale-while-revalidate=3600,stale-if-error=86400
x-rendered-by: cmok.openstreetmap.org
accept-ranges: bytes
age: 196
date: Mon, 08 Dec 2025 15:55:52 GMT
via: 1.1 varnish
x-served-by: cache-lcy-eglc8600024-LCY
x-cache: HIT
x-cache-hits: 0
x-timer: S1765209353.940283,VS0,VE2
vary: Origin, Accept-Encoding
strict-transport-security: max-age=31557600
alt-svc: h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=86400
content-length: 303501
{
"version": 8,
"name": "versatiles-colorful",
...
```
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