nginx.conf

user www-data;
worker_processes 1;

error_log  /var/log/nginx/error.log warn;
pid        /var/log/nginx/nginx.pid;

events {
    worker_connections 1024;
    multi_accept on;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    tcp_nopush      on;
    tcp_nodelay     on;
    keepalive_timeout  65;
    types_hash_max_size 2048;

    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    gzip  on;
    gzip_disable "msie6";

    upstream backend {
            least_conn;
            server web_green:8080 max_fails=5 fail_timeout=5s;
        }

        server {
            listen 80;
            server_name api.link-hub.site;

            return 301 https://$host$request_uri;
        }

        server {
            listen 443 ssl;
            server_name api.link-hub.site;
            charset utf-8;

            ssl_certificate /etc/letsencrypt/live/api.link-hub.site/fullchain.pem;
            ssl_certificate_key /etc/letsencrypt/live/api.link-hub.site/privkey.pem;

            ssl_protocols TLSv1.2 TLSv1.3;
            ssl_prefer_server_ciphers on;

            location / {
                proxy_pass http://backend;
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header X-Forwarded-Proto $scheme;
            }
        }
}