> For the complete documentation index, see [llms.txt](https://docs.umbraco.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.umbraco.com/umbraco-engage/getting-started/for-developers/content-delivery-network-recommendations.md).

# Content Delivery Network recommendations

Learn more about recommendations when working with the Content Delivery Network.

This article provides information and best practices on using Content Delivery Network (CDN) with Umbraco Engage.

## Pages (HTML)

Do not cache pages on the CDN level. Umbraco Engage is based on serving a unique page to every (returning) visitor. By enabling page caching every visitor will be assigned the same Umbraco Engage ID and Analytics, A/B testing, and Personalisation will not work correctly.

### Cache static files (CSS and JavaScript)

It is possible to cache static CSS and JavaScript files. Refer to the documentation of the CDN provider for the best-practice setup.

### Media files (Umbraco /media folder, images, and PDFs)

It is possible to cache `/media` files. Refer to the documentation of the CDN provider for best-practice setup.


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