itty-cors has been fully deprecated in favor of itty-router/cors.
This complete rewrite brings the following:
- full support for industry-standard options (matches express.js)
- far more control of matching/reflecting origins
- true wildcard support
- fixes a nasty race condition that could appear under heavy multi-user load
- 20% smaller (we somehow shed over 100 bytes)
- 100% test coverage, like anything in itty-router core