Login to OnApp Dashboard, navigate to 'CDN > CDN Management > HTTP Setting'.
The caching period of your CDN resources in edge servers. This is a global setting, by default, 60 minutes will be set.
Do note that this cache settings will be overrided by the cache expiry set at web origin (http header) and cache expiry setting at cdn resource level. Please check: https://onapp.zendesk.com/entries/22087876-Cache-Content-Expiry-in-CDN