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Cache Tags allow a website owner to add tags to items cached at the Akamai Edge.
The purpose of tagging is for a customer to be able to purge cached content by calling it with a natural-language identifier, instead of purging by URL, file extension, or CPCode.
Furthermore, since invalidation is a topic specific to each type of reverse proxy, using this concept will tie you to a specific reverse proxy or need additional efforts to support different proxies.
Sometimes, however, you need that extra performance you can get when explicitly invalidating.
It provides the ability to invalidate and/or delete cached content via API and UI in a rapid and predictable manner; improving offload and performance for fresh event-driven content.
Before Fast Purge, customers avoided caching event-driven content, or had to cache it for very short TTLs.
Reverse proxies usually provide a channel to receive such notifications, typically through special HTTP requests.
Caution While cache invalidation is powerful, avoid it when possible.
Releases created automatically by add-ons will not run the command exits with a non-zero exit status, or if it’s shut down by the dyno manager, the release will fail and will not be deployed to the app’s formation.The goal of caching in HTTP/1.1 is to eliminate the need to send requests in many cases, and to eliminate the need to send full responses in many other cases.The former reduces the number of network round-trips required for many operations; we use an "expiration" mechanism for this purpose (see section 13.2).If you fail to invalidate something, outdated caches will be served for a potentially long time.
Instead, use short cache lifetimes or use the validation model, and adjust your controllers to perform efficient validation checks as explained in .
HTTP is typically used for distributed information systems, where performance can be improved by the use of response caches.