“Load balancing” for php-fpm?

General
1

Looking for general suggestions, not specific help.

www.ellipticcurve.info {
        root            * /var/www/html/mediawiki
        header          /images/* X-Content-Type-Options nosniff
        php_fastcgi     *.php unix//run/php-fpm/www.sock { 
                        dial_timeout    5ms
                        lb_retries      6000
                        lb_try_interval 5ms
                        lb_try_duration 30s
                        read_timeout    90s
                        write_timeout   90s
        }

        file_server {
                        hide *.php
        }
        rewrite         {path} /index.php?title={path}
}

With only one socket pool accepting connections, it seems that I need to keep polling it for availability on an extremely short interval of “5ms” or so, or else caddy either fails to connect or drops connections immediately with a 502 error. The server does not seem to be under especially high load, but the default configuration doesn’t seem to work at all for me.

FWIW. Hoping to move to FrankenPHP.