CloudFlare's CDN caches the following types of static content by extension for all account types by default:
If you are looking for more advanced caching or performance options, please look at our paid plans that can help extend caching and performance for your site.
Note: CloudFlare can only cache resources on your site directly. External resources (Facebook, Flickr, etc.) will not be cached. CloudFlare does not cache by MIME type at this time.
Download text list of cacheable files here.