в логах 2020/08/05 13:35:42 [warn] 4576#4576: *4377683 an upstream response is buffered to a temporary file /tmp/nginx_proxy_temp/0000280737 while reading upstream, client: 178.хх.84.ххх, server: хххххх.ru, request: "GET /wp-admin/admin-ajax.php?action=rest-nonce HTTP/2.0", upstream: "http://127.0.0.1:8080/wp-admin/admin-ajax.php?action=rest-nonce"