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Expires Header Treatment

Applies To:
HTTP LargeThis platform has been optimized to cache and deliver static content (e.g., HTML, CSS, JavaScript, ISO, multimedia, and software downloads, etc.) over HTTP or HTTPS.
HTTP SmallLegacy. If you are currently serving traffic over this platform, then you may continue to do so. However, we recommend that you serve your traffic over our more robust HTTP Large platform.
ADNThe Application Delivery Network platform has been optimized to deliver dynamic content (e.g., login credentials, account information, etc.) over HTTP or HTTPS. Typically, user-specific and database-driven content are served over this platform.
Rules EngineAllows the customization of how requests are handled by our CDN service. It may be used to override the default response provided by an origin server, CDN settings, and the default edge server behavior. - Basic
Rules EngineAllows the customization of how requests are handled by our CDN service. It may be used to override the default response provided by an origin server, CDN settings, and the default edge server behavior. - Advanced

Category: Caching

Purpose: Determines how an edge server will handle the Expires header in the response sent to the client. This feature overrides the Expires header generated by the External Max-Age feature.

The easiest way to achieve this type of configuration is to place the External Max-Age and the Expires Header Treatment features in the same statement.

Value Result

Pass Through

Ensures that the following actions will take place:

  • Ensures that the Expires header produced by the External Max-Age feature is never added to the response.
  • If the origin server produces an Expires header, it will pass through to the end-user.

If the origin server does not set an Expires header, then this mode may cause the response to not include an Expires header.

Overwrite

Ensures that the following actions will take place:

  • Overwrites the Expires header generated by the origin server.
  • Adds the Expires header produced by the External Max-Age feature to the response.

Add if Missing

If an Expires header was not received from the origin server, then this option adds the Expires header produced by the External Max-Age feature. This option is useful for ensuring that all assets will be assigned an Expires header.

Remove

Ensures that an Expires header is not included with the header response. If an Expires header has already been assigned, then it will be stripped from the header response.

Default Behavior: Overwrite