With this behavior enabled you can specify the HTTP request headers and/or cookies to be logged in your Akamai Log Delivery Service reports.

Features and options

Field	What it does	Sub-options
Log Host Header	Log the `Host` header. This header specifies the domain name of the server (for virtual hosting), and (optionally) the TCP port number on which the server is listening.
Log Referer Header	Log the `Referer` header. This header contains the address of the previous web page from which a link to the currently requested page was followed. The `Referer` header allows servers to identify from where people are visiting.
Log User-Agent Header	Log the `User-Agent` header. This header contains a characteristic string that allows the network protocol peers to identify the application type, operating system, software vendor or software version of the requesting client.
Log Accept-Language Header	Log the `Accept-Language` header. This header advertises which languages the client is able to understand, and which locale variant is preferred.
Cookie Mode	Select whether you want to log all cookies, some cookies or no cookies.	Don’t log any cookies Log all cookies Log some cookies
Cookies	With Cookie Mode set to Log some cookies, provide the cookie names for which you want the values to be logged.	sessionid user_local
Include Custom Log Field	Whether to append additional custom data to each log line.
Custom Log Field	With Include Custom Log Field set to On, enter the information for the custom log field. This field will be truncated to 128 bytes of data and escaped per RFC1738. This field can only contain request information. To log response information, use the Log Custom Details behavior. This option supports variable expression syntax. Typing {{ in the option field triggers variable autocomplete. Learn more about variable support.
Log Akamai Edge Server IP Address	Log the IP address of the Akamai edge server which served the response to the client.
Log X-Forwarded-For Header	Log the `X-Forwarded-For` request header if it was passed.