cache tag visible

Property Manager name: Cache Tag Visibility
Behavior version: The v2025-01-13 rule format supports the cache_tag_visible behavior v1.0.
Rule format status: GA, stable
Access: Read/Write
Allowed in includes: Yes

Cache tags are comma-separated string values you define within an Edge-Cache-Tag header. You can use them to flexibly fast purge tagged segments of your cached content. You can either define these headers at the origin server level, or use the modify_outgoing_response_header behavior to configure them at the edge. Apply this behavior to confirm you're deploying the intended set of cache tags to your content.

See Fast Purge for guidance on best practices to deploy cache tags. Use the Fast Purge API to purge by cache tag programmatically.

Option	Type	Description
`behavior`	enum	Specifies when to include the `Edge-Cache-Tag` in responses.	{"displayType":"enum","options":["NEVER","PRAGMA_HEADER","ALWAYS"],"tag":"select"}
	`NEVER`	Strip out the `Edge-Cache-Tag` header, edge servers' default response.
	`PRAGMA_HEADER`	Edge servers respond with the `Edge-Cache-Tag` header only when you pass in a `Pragma: akamai-x-get-cache-tags` header as part of the request.
	`ALWAYS`	Include the `Edge-Cache-Tag` header in all responses.