Is possible to add custom http headres to the access logs?
In my country, in addition to the IP (X-Forward-For), it is also necessary record the high port used in the connection (63215: -> 80) to identify the ISP's client. Usually I use a load balancer to add an HTTP HEADER to the request (X-PORT-FOR), and send both X-FORWARD-FOR and X-PORT-FOR to the access logs.