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The Use CDN add-on integrates Concrete CMS 9.0.0 and later with a pull-based Gcore CDN resource. It rewrites static asset URLs in rendered HTML so visitors load them through the resource’s custom domain.
Back up site files and the database before making changes.The add-on rewrites rendered HTML with regular expressions, which may break HTML and increase time to first byte. It does not process dynamically loaded content or absolute references inside CSS, JavaScript, and HTML files.Disable the add-on if rewritten pages or assets fail to load correctly.
Create a CDN resource with the Concrete CMS website as its origin because the add-on supports only pull-based CDN configurations. Configure a custom domain, verify its CNAME record points to Gcore, and confirm that the domain has a valid SSL certificate.
1

Install the add-on

Install the Use CDN add-on from the Concrete CMS Marketplace.
2

Open CDN Settings

In the Concrete CMS dashboard:
  1. Select System & Settings.
  2. Select Optimization.
  3. Select CDN Settings.
3

Enter the custom domain

Enter the custom domain configured for the CDN resource in the Gcore Customer Portal. A custom domain typically looks like cdn.site.com.
4

Apply the changes

Save the settings.
5

Confirm the integration

The add-on rewrites URLs only for visitors who are not logged in as administrators:
  1. Log out of Concrete CMS or open the website in an incognito window.
  2. Open the browser developer tools with F12.
  3. Select the Network tab.
  4. Refresh the page.
  5. Confirm that static files load from the custom domain instead of the original domain.