self-host-101/caddy/pokemon.Caddyfile

pokemon.domain.com {
    reverse_proxy :8080     # Assuming the application is running at PORT 8080

    handle_errors {
        root * /var/www
        rewrite * /error.html
        templates
        file_server
    }
}

# just domain name looks much cleaner
www.pokemon.domain.com {
    redir pokemon.domain.com{uri}
}