size_t *ret_buffer_fill, size_t *ret_buffer_free,
const data_set_t *ds, const value_list_t *vl,
int store_rates, char const *const *http_attrs,
size_t *ret_buffer_fill, size_t *ret_buffer_free,
const data_set_t *ds, const value_list_t *vl,
int store_rates, char const *const *http_attrs,