Date, Expires, If-Modified-Since, If-Unmodified-Since, Last-Modified.
Definition: http.h:219
msg_content_length_t * msg_content_length_create(su_home_t *home, uint32_t n)
http_date_t * http_date_create(su_home_t *home, http_time_t t)
Create an Date header object.
Definition: http_basic.c:584