un 1643 http/ngx_http_upstream.c ngx_http_upstream_next_t *un; un 1647 http/ngx_http_upstream.c for (un = ngx_http_upstream_next_errors; un->status; un++) { un 1649 http/ngx_http_upstream.c if (status != un->status) { un 1653 http/ngx_http_upstream.c if (u->peer.tries > 1 && (u->conf->next_upstream & un->mask)) { un 1654 http/ngx_http_upstream.c ngx_http_upstream_next(r, u, un->mask); un 1661 http/ngx_http_upstream.c && (u->conf->cache_use_stale & un->mask))