Built-in system variables

This table lists all the built-in system variables available to you. For any of these items that are optional, such as filename extensions, the inserted variable may yield a blank string. Note that the AKA prefix for the first variable listed varies from all others.

Name	Description
`AKA_PM_CACHEABLE_OBJECT`	Either `true` if the requested object is cacheable, or `false` if not.
`AK_BASE_URL`	The incoming request's URL path, without filename and extension.
`AK_CLIENT_IP`	Client IP address as seen by the Akamai server, possibly overridden by `X-Forwarded-For` or `Akamai-Client-IP` request headers.
`AK_CLIENT_REAL_IP`	The client IP address as seen by the Akamai server, ignoring any request headers.
`AK_CLIENT_RTT`	Milliseconds elapsed for the TCP round-trip (RTT) between client and edge server.
`AK_CLIENT_TRANSFER_TIME`	Milliseconds elapsed to transfer content from edge to client. This value is only available after the client response completes. Applies only to custom log fields.
`AK_CLIENT_TURNAROUND_TIME`	The time in milliseconds between receiving the end of the request headers and writing the first byte of the reply to the client socket. This includes the time it takes for the edge servers to fetch the object from another server or to perform validation of the object's freshness if the object was in cache. In both of these cases there is a forward request corresponding to the client request. Note that this variable only applies to custom log fields and can be successfully used only when enclosed in an `matchAdvanced`.
`AK_CONNECTED_CLIENT_IP`	The IP on the TCP socket, either client or a redirecting ghost.
`AK_CPCODE`	The CP code assigned to the request.
`AK_CURRENT_TIME`	The epoch time when edge metadata is applied to the request. If necessary, use the `setVariable` behavior to convert epoch time values to other time formats.
`AK_DOMAIN`	The hostname without the initial subdomain, such as `example.com` when requesting `www.example.com`.
`AK_EXTENSION`	The filename extension of the incoming request.
`AK_EDGEWORKERS_FAILURE`	Populated when an EdgeWorkers error occurs.
`AK_EDGEWORKERS_RP_STATUS`	The execution status of the EdgeWorkers event using the responseProvider event handler.
`AK_EDGEWORKERS_STATUS`	The execution status of the EdgeWorkers event using the onOriginRequest/Response and onClientRequest/Response event handlers.
`AK_FILENAME`	The complete filename of the incoming request.
`AK_FIREWALL_ALERTED_RULES`	With `webApplicationFirewall` enabled, a colon-separated list of IDs for firewall rules that triggered an alert for the current request.
`AK_FIREWALL_DENY_RULEID`	With `webApplicationFirewall` enabled, the ID for a firewall rule set to `deny` the request when the rule triggers.
`AK_FIREWALL_DETECTED_RULES`	With `webApplicationFirewall` enabled, a colon-separated list of IDs for all firewall rules that apply to the request.
`AK_FIREWALL_MITIGATED_RULES`	A colon-separated list of IDs for firewall rules that were mitigated for the current request.
`AK_FIREWALL_TRIGGERED_RULES`	A colon-separated list of IDs for firewall rules that were triggered for the current request.
`AK_GHOST_IP`	The IP address on which end client requests are received, and ultimately resolve for the end user.
`AK_GHOST_SERVICE_IP`	The edge server IP address used to forward a request, also commonly known as the machine IP. This is the IP address the origin server sees as the client IP when it receives a request from the edge.
`AK_HOST_CNAME_CHAIN`	A space-delimited list of the CNAME chain provided by DNS lookup on the incoming `Host` header.
`AK_HOST`	The incoming request's hostname.
`AK_MAPRULE`	The maprule for the incoming request, such as `a123.g.akamai.net`.
`AK_METHOD`	The request method, such as `GET`, `PUT`, `POST`, or `HEAD`.
`AK_ORIGINAL_URL`	The original URL before any processing by Akamai Edge servers.
`AK_ORIGIN_DNS_NAME`	The hostname the Akamai server resolved to go forward to the origin.
`AK_PATH`	The original URL path as seen by the Akamai Edge server.
`AK_PROTOCOL_NEGOTIATION`	The protocol negotiated with the client when NPN or ALPN is in use. Under HTTP, possible values are `http/1.1` or `http/1.0`. For HTTP2, values are `h2-14` or `h2`. For HTTP3, values are `h3-29` or `h3`. For SPDY, values are `spdy/3.1`, `spdy/3` or `spdy/2`.
`AK_QUERY`	The URL's entire query string.
`AK_REFERENCE_ID`	The global identifier for the request across the Akamai platform.
`AK_REQUEST_ID`	Unique identifier for each request on the edge server, the same as reported in logs.
`AK_SCHEME`	The request scheme, either `http` or `https`.
`AK_SLOT`	The incoming request's slot number.
`AK_TLS_CIPHER_NAME`	For HTTPS and SPDY requests, specifies the name of the cipher used for the SSL connection, otherwise `NO-CIPHER` for HTTP requests.
`AK_TLS_ENCRYPTION_BITS`	Bits of encryption used for the request.
`AK_TLS_PREFERRED_CIPHERS`	The value of the request's `security:essl.slot-assignment.preferred-ciphers` tag.
`AK_TLS_SNI_NAME`	The SNI name submitted by the client.
`AK_TLS_VERSION`	The TLS version used for the connection.
`AK_URL`	The incoming request's entire URL.