gistfile1.txt

    # Default TTL and grace
    set obj.grace = 604800s;
    set obj.ttl = 604800s;
    
    # For really young (last-modified < 15 min ago) objects, use lower (1 min) ttl
    if (obj.http.Last-Modified) {
	C{ 
	    #include <sys/time.h>
	    
	    struct timeval tv;
	    gettimeofday(&tv, 0);
	    
	    if (tv.tv_sec - TIM_parse(VRT_GetHdr(sp, HDR_OBJ, "\016Last-Modified:")) < 900) {
		VRT_l_obj_ttl(sp, 60);
	    }
	}C
    }