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The CenturyLink® Caching and Download service gives you a flexible and cost-effective solution to deliver your digital content to web users across the globe.


Configurations tell the CenturyLink CDN (content delivery network) what to do when it receives requests for your content. You use definitions, properties, and match rules to build a configuration. Then, you promote the configuration to an environment to activate it.

Service-wide definitions

Service-wide definitions are collections of common configuration data that can be referenced and that influence system behavior. Examples of definitions are a geo region or IP group. In and of itself, a definition does not influence how the system processes requests. Using definitions helps you avoid having to repeat common tasks across multiple match rules. You manage them in a single list allowing for a single change to propagate through all references.


A property is a key component in a configuration and container of all match rules. It is comprised of a primary alias, 0 or more secondary aliases, and an origin.

Match rules

Match rules are the core of the configuration. They provide the criteria for evaluating requests and responses and, when matched, specify one or more actions (e.g., setting cache expiration, calling geo definitions, content/header processing modes, etc.) for the system to take. Property-based settings have the implied criteria of “all requests” and, therefore, any settings selected will apply to all requests to aliases specified within the property definition. Criteria-based settings are applied only if the specified criteria (a path) is met.
  • Adding a match rule to a configuration (coming soon)