;; headers may be parsed further, which may turn it into a list, whose car
;; is the original value and whose subsequent elements depend on the
;; header. For formatting, it is evaluated to obtain the strings to be
;; headers may be parsed further, which may turn it into a list, whose car
;; is the original value and whose subsequent elements depend on the
;; header. For formatting, it is evaluated to obtain the strings to be