Validate Entity Tag (ETag)

Add another layer of validation for the cached objects. Validation of entity tags improves efficiency of caches and saves bandwidth by preventing unnecessary data transfer.

How it works

Instructs edge servers to compare the request's If-None-Match header with the ETag value of the cached object. If they are the same, the edge server returns a 304 Not Modified response containing only headers. If they differ, the edge server requests a new copy of the object from your origin server. This validation occurs in addition to the default validation of Last-Modified and If-Modified-Since headers.

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Note that โ€‹Akamaiโ€‹ only supports strong ETag values. Weak ETag values are ignored and edge servers always return a 200 response with full body. For more details, see the RFC Standard.

This behavior doesn't include any options. Specifying the behavior itself enables it.