Pragma headers

This is the list of Akamai Pragma headers you can use when creating a request in the Request Content (CURL) tool and Advanced URL Health Check problem scenario.

Pragma request header passed	Pragma response header obtained	Description
`akamai-x-cache-on`	`X-Cache`	Returns information about how the edge server response was served. Some example responses are: - `TCP_HIT`: The object was fresh in cache and the object was fetched from the disk cache. - `TCP_MISS`: The object was not in cache and a server fetched it from an origin server. - `TCP_REFRESH_HIT`: The object was stale in cache and was successfully refreshed with the object from an origin server with the `If-Modified-Since` request. - `TCP_REFRESH_MISS`: The object was stale in cache and refresh obtained a new object from an origin server in response to the `If-Modified-Since` request. - `TCP_REFRESH_FAIL_HIT`: The object was stale in cache and an origin server couldn't be reached to refresh it, so the stale object was served. - `TCP_IMS_HIT`: The `If-Modified-Since` request arrived from a client and object was fresh in cache and served. - `TCP_NEGATIVE_HIT`: The object previously returned a `Not found` response (or other negatively cacheable response) and that cached response was hit for the new request. - `TCP_MEM_HIT`: The object was on a disk and in the memory cache. A server served the object without hitting the disk.
`akamai-x-cache-remote-on`	`X-Cache-Remote`	Returns information about how the parent server response was served. For example responses, see the `akamai-x-cache-on` description.
`akamai-x-check-cacheable`	`X-Check-Cacheable`	Returns a flag to indicate whether the response is cacheable, either `YES` and `NO`.
`akamai-x-get-true-cache-key`	`X-True-Cache-Key`	Returns the `true` cache key used for the MD5 hashing. It doesn't include the scheme (HTTP/HTTPS) or the request method (GET, POST etc.).
`akamai-x-get-cache-key`	`X-Cache-Key`	Returns the cache key used for the request, including the serial number, CP code, and the TTL for the response.
`akamai-x-serial-no`	`X-Serial`	Returns the serial number used for the request. This is also returned in the `X-Cache-Key` response header.
`akamai-x-get-request-id`	`X-Akamai-Request-ID`	Returns the ID of the request, used to identify the request in the logs. If `cache-h` (Tiered Distribution or SiteShield) is being used, the ID will be of the format `{parent-id}.{child-id}`.