Assigning cache tags
This section explains the concept of assigning cache tags
You add cache tags to your cacheable content by providing all tags for each object in an Edge-Cache-Tag HTTP response header to outbound traffic at your origin. If there are multiple Edge-Cache-Tag HTTP response headers, only the first one will be respected.
Logically, cache tags should be considered part of the tagged content. Thus, new or changed tags need to be returned with a 200 response from the origin. A 304 response does not update the cache tags.
To make sure tags are assigned to all targeted objects on Akamai's network, wait until they refresh based on their time-to-live (TTL) value, or purge them.