CDN for Joomla! uses the options below. Labels and descriptions follow the current English extension language strings. Rows marked as Pro are editable only in the Pro edition; Free either omits the control or keeps its documented fixed value.

Options

Download KeyPlease enter your Download Key from the Regular Labs website here. You can find your Download Key under Downloads on the Regular Labs website after logging in.

Pro only.

Setup

CDN DomainEnter the CDN hostname without a protocol, for example cdn.example.com. Free uses the first valid hostname.

Pro only: Enter a comma-separated list to distribute files across multiple CDN hostnames. Each file is assigned deterministically, so its CDN URL remains stable. Pro also supports the {subdomain}, {domain}, and {extension} placeholders for parts of the current site hostname.
CDN ProtocolSelect the protocol for generated CDN URLs. Free follows the protocol of the current page. Pro can select the same protocol, http://, or https://.

Options: Same, HTTP PRO, HTTPS PRO
Use Relative ProtocolUse a protocol-relative // URL when the selected CDN protocol matches the current page, instead of an explicit http:// or https:// URL.

Options: No, Yes

Pro only.
Site DomainsSelect whether this CDN set applies to every site hostname or only to specific hostnames. Free applies its one CDN set to every site hostname.

Options: All, Specific

Pro only.
Specific DomainsEnter a comma-separated list of site hostnames on which this CDN set should be used. Do not include a protocol or path.

Pro only.
Site RootEnter the site folder connected to the CDN origin. This folder prefix is removed from the generated CDN path. Leave this at / when the complete site root is connected, or use a folder such as /images/.
Enable on ProtocolSelect on which page protocols this CDN set is active. Free always runs on both HTTP and HTTPS pages and follows the current page protocol.

Options: Both, HTTP, HTTPS

Pro only.
File TypesEnter a comma-separated list of file types whose matching local URLs should be rewritten to the CDN hostname.
Ignore FilesEnter a comma-separated list of path or filename fragments to ignore. Matching URLs are left unchanged.
Enable in Inline ScriptsConvert matching file URLs found in inline JavaScript. Disable this if a particular script is not compatible with URL rewriting.

Options: No, Yes
File VersioningAdd the local file modification time to eligible file URLs. This makes the origin-pull CDN request a new version after the local file changes. Only existing, safe site files with a selected file type are versioned. The required filesystem checks may add work while rendering the page.

Options: No, Yes

Pro only.
Versioning File TypesEnter a comma-separated list of file types to which file versioning should be applied.

Pro only.