NGX_HTTP_UPSTREAM_DOWN  233 http/modules/ngx_http_upstream_ip_hash_module.c                   |NGX_HTTP_UPSTREAM_DOWN;
NGX_HTTP_UPSTREAM_DOWN 3966 http/ngx_http_upstream.c                                          |NGX_HTTP_UPSTREAM_DOWN
NGX_HTTP_UPSTREAM_DOWN 4161 http/ngx_http_upstream.c             if (!(uscf->flags & NGX_HTTP_UPSTREAM_DOWN)) {