The original title is about a Cloudflare Workers deploy button that disabled auth accidentally. Let me craft a concise headline.

Short summary

A Cloudflare Workers deploy button accidentally shipped development settings to production by treating the .dev.vars.example file as live configuration. The author fixed it by commenting unused config, validating local requests via cf-ray header, and systematically rejecting placeholder values at multiple layers—applying defense-in-depth when untrusted config reaches production.

• •Deploy-to-Cloudflare button shipped DEV_BYPASS_ACCESS=true and test API keys to production because it treated .dev.vars.example as installer input
• •Root cause: example file meant for human copying became an automated prompt without the manual editing step
• •Multi-layer fix: only prompt for required secrets, detect local requests via cf-ray header, reject known placeholder strings at validation

Generated with AI, which can make mistakes.