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Edge and Serverless posts

Cloudflare Workers, Deno, and edge functions, where familiar Node APIs quietly disappear and a missing header turns into a failed deploy.

2 posts in Edge and Serverless

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Network cables plugged into a switch, lit in purple, representing edge network routing

Edge and Serverless21 Jul 20267 min readReader favourite

Cloudflare Workers Reject POST Requests with a CORS Preflight Failure

A Worker that served GET requests without complaint started rejecting every POST from the browser with an opaque CORS error. The request never reached my handler at all, because the preflight was answered long before my routing logic ran.

Edge and Serverless15 Apr 20267 min read

Deno Cannot Resolve Node Built-ins After Migrating a Legacy Script

Moving a maintenance script from Node to Deno should have taken an afternoon. It took two days, and nearly every hour went into imports that resolve in one runtime and simply do not exist in the other.