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22-Feb-2016 21:11

In addition to its greater flexibility in terms of response body content returned, response header invalidation requires less coding effort on the part of the Web applications since building an invalidation header is a fairly lightweight task.

For more information about using ESI invalidation, see Section 11.3.

Response header invalidation is Oracle Web Cache functionality that enables an origin server to return a transactional response whose response body contains something other than HTML.

This is a circumstance in which ESI inline invalidation does not work; Oracle Web Cache can only use ESI invalidation tags in conjunction with a response body that contains HTML.

With response header invalidation, origin servers can send invalidation directives in a proprietary invalidation response header.

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As described in Section 6.7, you create expiration policies and associate them with caching rules to refresh content from the origin server.Even with expiration policies, it is often difficult to predict when exactly content becomes stale.For instance, when a customer purchases a vegetarian cookbook on an e-commerce site, the confirmation response could contain instructions for invalidating all catalog pages related to the book, its author and vegetables.The ability to send invalidation message inline reduces the connection overhead associated with sending out-of-band invalidations and is a useful tool for ESI developers.

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When objects are marked as invalid and a client requests them, they are removed and then refreshed with new content from the origin servers.

You can choose to remove and refresh invalid objects immediately, or base the removal and refresh on the current load of the origin servers.