Create 2025-10-23-preview-url-default-behavior

Author: dinasaur404

src/content/changelog/workers/2025-10-23-preview-url-default-behavior

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+---
+title: Workers Preview URL default behavior now matches your workers.dev setting
+description: If a Workers Preview URL setting is not explicitly configured, its default behavior will now match the setting of the workers.dev subdomain.
+date: 2025-10-23
+---
+We have updated the default behavior for Cloudflare Workers [Preview URLs](/workers/configuration/previews/). Going forward, if a preview URL setting is not [explicitly configured](/workers/configuration/previews/#toggle-preview-urls-enable-or-disable) during deployment, its default behavior will automatically match the setting of your `[workers.dev` subdomain](/workers/configuration/routing/workers-dev/).
+
+This change is intended to provide a more intuitive and secure experience by aligning your preview URL's default state with your `workers.dev` configuration to prevent cases where a preview URL might remain public even after you disabled your `workers.dev` route.
+
+Here is how the new default logic works:
+
+- If your `workers.dev` route is enabled (or not configured) and no preview URL is set, Preview URLs will default to enabled.
+
+- If your `workers.dev` route is disabled and no preview URL is set, Preview URLs will default to disabled.
+
+You can override the default setting by explicitly enabling or disabling the preview URL in your Worker's configuration through the [API](/api/resources/workers/subresources/scripts/subresources/subdomain/), [Dashboard](/workers/configuration/previews/#from-the-dashboard), or [Wrangler](/workers/configuration/previews/#from-the-wrangler-configuration-file). This new logic applies when deploying with the latest version of Wrangler.
+
+To further secure your `workers.dev` subdomain and preview URL, you can [enable Cloudflare Access with a single click](/changelog/2025-10-03-one-click-access-for-workers/) in your Worker's settings to limit access to specific users or groups.