А под спойлер не хочет кидать...
Пришлю так:
2021/04/04 21:15:25 [warn] 131328#0: *4884 an upstream response is buffered to a temporary file /var/lib/nginx/tmp/fastcgi/3/04/0000000043 while reading upstream, client: 178.121.10.16, server: forum.ds-host.ru, request: "GET /css.php?css=public%3Anormalize.css%2Cpublic%3Afa.css%2Cpublic%3Acore.less%2Cpublic%3Aapp.less&s=1&l=10&d=1617560096&k=ea51f44bc366997dfd2a245e0006363c63dcffa0 HTTP/2.0", upstream: "fastcgi://unix:/var/www/php-fpm/kenji.sock:", host: "forum.ds-host.ru", referrer: "https://forum.ds-host.ru/"