cache cache

Cache Control. Allows selectively disabling client-side caching (browser, proxy servers, network caching systems) and caching in the internal Platform Server cache.

cache= *cacheControl*

cache= *clientControl*, *serverControl*


If only one *cacheControl* value is specified, it is applied to both client and server caches.

The validate keyword allows updating cache entries after image files have changed, without having to wait for the cache entry to expire automatically. Client caching is not affected by this command.

The update keyword can be used to force updating server-side cache entries. This is useful after resources have been changed which are not tracked directly by the cache validation mechanism, such as when a font file is modified without changing its file name or the associated font id.

If specified in a nested request, cache=on enables persistent, server-side caching of the image generated by the nested request. Care should be taken to enable caching for nested requests only when the same nested request is expected to be called repeatedly with exactly the same parameters.

Properties section-dfd0b2f92b3743fc8b9d2c35a786eb81

Request attribute. Applies regardless of current layer setting. Ignored when the request does not return a reply image. *clientControl*is ignored when client-side caching is disabled by the image catalog (if catalog::Expiration has a negative value).

Client-side cache control ( on and off only) is also available for static content requests at /is/content/.

Default section-4124b2c836e2491489b9009a92fe4f22

cache=on,on for HTTP requests, cache=off for nested/embedded requests, cache=on for static content requests.

See also section-7c2ac171fa0e4aa4a2e9955fd2d2013e

catalog::Expiration , req=