product · inferred from evidence
CORS
Cross-Origin Resource Sharing, a mechanism for enabling cross-origin requests in web applications.
- Notion API calls from the browser are blocked by CORS policy
You cannot call the Notion API directly from browser JavaScript, and this is by design, not a bug. Notion does not send CORS headers, so the browser will block the requests no matter what.
- GCS signed URL upload fails CORS: preflight OK, PUT rejected
GCS signed URL upload fails CORS: preflight OK, PUT rejected. When generating the signed URL, pass the exact Content-Type the client will upload with (e.g.