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This update introduces optional email-based authentication for Quick Tunnels via the `--allowed-mail` flag, allowing developers to restrict access to their local services without requiring a Cloudflare account. While the core utility remains facilitating agent workflows and rapid deployment of local dev environments, this security layer directly addresses emerging risks where autonomous agents might inadvertently expose sensitive data to the public internet.

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Protected Quick Tunnels: simple accountless authentication for your next dev project

Cloudflare BlogOctober 2, 20267 min read

Quick Tunnels now support email authentication. Add --allowed-mail to one cloudflared command, and only the addresses or domains you list can reach your local app. No Cloudflare account required on either side.

We launched Quick Tunnels in 2021 to give developers an easy way to share their latest service, application, or project running in their local development environment. A lot has changed since then, but the core use case remains the same. Your coding agent has just finished the feature. The dev server is up on localhost:5173, and before you ask, the agent offers to let you try it on your phone. It runs one command and hands you a link: That command starts a Quick Tunnel. cloudflared, Cloudflare's lightweight connector, publishes your local service at a random trycloudflare.com URL. No account, no domain, no cost. Agents now use Quick Tunnels for the same reason people do: they are the shortest path from a local port to a URL. The catch has always been the same. Anyone with the link can…

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