By configuring the browser cache validity, you can customize client browser cache policies to reduce origin-pull rate.
When a request comes, if the requested resource is cached on the browser, it will be returned directly. If no, the request will be forwarded to CDN cache nodes. If the resource still cannot be found on the cache node, the request will be forwarded to the origin server.
Log in to the CDN console, select Domain Management on the left sidebar, click Manage on the right of a domain name to enter its configuration page. Open the Cache Configuration tab to find the Browser Cache Validity Configuration section.
Click Add Rule to add browser cache validity rules for specified file type, file directory, file path, and homepage.
Cache-Controlheader of the origin server.