web / CORS / preflight
CORS and preflight review guide
Review the boundaries between origins, methods, request headers, credentials and allowed responses with synthetic cases. No network request is made.
Permission boundaries
Keep CORS response headers and preflight conditions distinct when reviewing an integration.
| Case | Result | Key point |
|---|---|---|
| Choose a case to show the matrix. | ||
Why no real request is handled
This page performs no URL fetch, upload, external request, cookie, storage, or parsing.
Synthetic results do not certify a real browser or server CORS decision. Confirm the actual Origin and response headers separately.