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An ETag or entity tag is one of several mechanisms that HTTP provides for cache validation. ETags are used by servers and browsers to validate cached components. ETags enable a client to make conditional requests.
An ETag is an identifier assigned by a web server or a browser to a specific version of a resource. If the resource content ever changes, a new and different ETag is assigned. Used in this manner, ETags are similar to fingerprints and can be compared to determine if two versions of a resource are the same or not.
The use of ETags in the HTTP header is optional.
Avaya Voice Browser supports the use of ETags. For information on disabling ETag directives, see http://www-01.ibm.com/support/docview.wss?uid=swg21566450.