Vite
Vite built file failed because it was opened over the file protocol
Access to script at 'file:///foo/bar.js' from origin 'null' has been blocked by CORS policy
A built Vite app was opened directly from the filesystem, but browser security blocks module and asset loading over the `file://` protocol.
Observed message
Access to script at 'file:///foo/bar.js' from origin 'null' has been blocked by CORS policy
Why it happens
- The generated HTML was opened directly from the filesystem.
- Browser same-origin rules block module loading from `file://` URLs.
- The built app is being tested without an HTTP server.
How to fix it
- Serve the built app over HTTP instead of opening the HTML file directly.
- Use `vite preview` or another static server to test the production build.
- Avoid validating browser module behavior using the `file://` protocol.
