Response to preflight request doesn't pass access control check

[unsingefou]

Response to preflight request doesn't pass access control check

[alexiglesias93]

+1

I'm experiencing the same issue when working locally (vercel dev) with Vercel + Hono, it seems that Vercel is somehow not handling OPTIONS requests correctly. I've been trying to debug this but my local server never receives the request at all if it contains a Preflight.
When deploying, it works as expected.

[alexiglesias93]

I've been further testing and the issue starts happening on [email protected] onwards. If I pin the version to any previous versions and use vercel dev the issue doesn't happen anymore.

[durdenx]

I have the same issue with graphql yoga. OPTIONS method is blocked. Is there any solution?

[huynhr]

After digging around for hours I ran into this discussion-2794, and someone pointed out that if you remove your headers from the client then it will work. Lo and behold it works 🙏🏼 . I tested this both for serverless and express. No longer running into cors issues, you'll also have to set the headers in the vercel.json as per docs.