Instructs edge servers to compare the request's ETag header with that of the cached object. If they differ, the edge server sends a new copy of the object. This validation occurs in addition to the default validation of Last-Modified and If-Modified-Since headers.

Note that Akamai only supports strong ETag values. Weak ETag values are ignored and a full response is always returned. For more details, see the RFC Standard.


Enables the ETag validation behavior.