time_t now)
unsigned int off)
static void httpd__conf_req_reset_expires(struct Httpd_req_data *req,                                          time_t now){  Vstr_base *s1 = req->xtra_content;  size_t pos = req->expires_pos;  size_t len = req->expires_len;  Opt_serv_opts *opts = req->policy->s->beg;  Httpd_opts *hopts = (Httpd_opts *)opts;    ASSERT(vstr_sc_poslast(pos, len) == s1->len);    if (vstr_sub_cstr_buf(s1, pos, len, date_rfc1123(hopts->date, now)))    req->expires_len = vstr_sc_posdiff(pos, s1->len);}