#vercel
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Hardening the open CORS proxy — allowlists, SSRF guards, and the bypass I almost left behind
A year after building an open serverless CORS proxy, I closed the open-relay hole it had become — target and origin allowlists, SSRF guards, a resilience layer — and learned a sharp lesson about a forgotten debug endpoint that Vercel was still routing.
Building a Serverless CORS Proxy with Vercel - Simplifying Cross-Origin Requests
A practical exploration of building a serverless CORS proxy using Vercel's serverless functions, offering an elegant solution to the common cross-origin resource sharing challenges faced by frontend developers.