We've updated preview URLs for Cloudflare Workers to support long branch names. Previously, branch and Worker names exceeding the 63-character DNS limit would cause alias generation to fail, leaving pull requests without aliased preview URLs. This particularly impacted teams relying on descriptive branch naming. Now...
Workers - Workers per-branch preview URLs now support long branch names
Cloudflare Developer Platform Changelog · 2025-08-14
Related items
Workers - Preview URLs now default to opt-in
To prevent the accidental exposure of applications, we've updated how Worker preview URLs ( PREVIEW-WORKERNAME.SUBDOMAIN.workers.dev ) are handled. We made this change to ensure preview URLs are only active when intentionally configured, improving the default security posture of your Workers. One-Time Update for Wor...
Workers - Workers Preview URL default behavior now matches your workers.dev setting
We have updated the default behavior for Cloudflare Workers Preview URLs . Going forward, if a preview URL setting is not explicitly configured during deployment, its default behavior will automatically match the setting of your workers.dev subdomain . This change is intended to provide a more intuitive and secure e...
Workers - Access Workers preview URLs from the Build details page
You can now access preview URLs directly from the build details page, making it easier to test your changes when reviewing builds in the dashboard. What's new A Preview button now appears in the top-right corner of the build details page for successful builds Click it to instantly open the latest preview URL Matches...
Workers - Test out code changes before shipping with per-branch preview deployments for Cloudflare Workers
Now, when you connect your Cloudflare Worker to a git repository on GitHub or GitLab, each branch of your repository has its own stable preview URL, that you can use to preview code changes before merging the pull request and deploying to production. This works the same way that Cloudflare Pages does — every time yo...
Workers - Better Windows support for Python Workers
Pywrangler , the CLI tool for managing Python Workers and packages, now supports Windows, allowing you to develop and deploy Python Workers from Windows environments. Previously, Pywrangler was only available on macOS and Linux. You can install and use Pywrangler on Windows the same way you would on other platforms....
Workers for Platforms - Workers for Platforms now supports Static Assets
Workers for Platforms customers can now attach static assets (HTML, CSS, JavaScript, images) directly to User Workers, removing the need to host separate infrastructure to serve the assets. This allows your platform to serve entire front-end applications from Cloudflare's global edge, utilizing caching for fast load...