Nginx Reverse Proxy configuration template (replace $SERVER_NAME and configure TSL certificates with certbot)

nginx.conf.tpl

upstream app_server {
    server 127.0.0.1:8080;
    keepalive 16;
}

server {
    server_name $SERVER_NAME;

    add_header X-Frame-Options "DENY";

    location / {
        proxy_pass http://app_server;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Connection "";
        client_max_body_size 20M;
    }
}