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The Browser caching option controls how long CDN content is stored in end users’ browsers. Two modes are available: Origin controlled and CDN controlled. Use Origin controlled when the origin server already manages browser cache duration through response headers. Use CDN controlled to set a fixed expiry independently of origin configuration. When Origin controlled is active, Gcore CDN passes the origin’s Cache-Control header to browsers unchanged. If the origin sends no Cache-Control, browsers may apply heuristic caching if a Last-Modified header is present. If neither header is present, content is not cached in the browser. When CDN controlled is active, Gcore CDN overrides origin cache headers and adds the following to each response:
  • Cache-Control — sets the maximum browser cache time. A 12-hour expiry returns Cache-Control: max-age=43200.
  • Expires — calculated from the current time plus the max-age value.
Browser caching applies to responses with codes 200, 201, 204, 206, 301, 302, 303, 304, 307, 308. Responses with other codes will not be cached.

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Enable browser caching

To enable and configure browser caching on a CDN resource:
1

Navigate to CDN resources

In the Gcore Customer Portal, navigate to CDN and click the custom domain of the target resource.
CDN resources list with custom domain names
2

Open browser caching settings

In the Cache section, click Browser caching.
CDN resource settings with Browser caching toggle enabled and Origin controlled dropdown
3

Enable the toggle

Turn on the Enable browser caching toggle.
4

Select the caching mode

From the dropdown, select Origin controlled or CDN controlled. If Origin controlled is selected, the configuration is complete — proceed to save. For CDN controlled, configure the expiry using the expandable block.
From the list, select an expiry period. The recommended value is four days.
Cache expiry dropdown in CDN controlled mode showing duration options
To set a duration not in the list, select Custom value and enter the cache expiration time in seconds — to cache content for one day, enter 86400.
Custom value field in CDN controlled mode with 86400 seconds entered
5

Save

Click Save changes.