New in Symfony 5.1: Remote asset manifest

Contributed by Jérôme Tamarelle in #35762

Webpack Encore is a pure-JavaScript library developed by Symfony as a simpler way to integrate Webpack into your application. When building assets, Webpack Encore creates a manifest.json file listing all the generated assets (and their versioning).

In Symfony 5.1, we've improved this feature to allow using manifest files stored in other servers and retrieved via HTTP requests. This is useful when using CDNs (content delivery networks) to serve your assets.

You don't need to add or enable any option to use this new feature. Just update the value of your existing json_manifest_path option and use an absolute URL. Symfony will make an HTTP request automatically to retrieve the manifest:

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# config/packages/assets.yaml
framework:
    assets:
        json_manifest_path: 'https://cdn.example.com/manifest.json'