@mnncloud 이렇게 했지요;;

upstream backend {
    server web1 max_fails=3 fail_timeout=15s;
    server web2 max_fails=3 fail_timeout=15s;
    }

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

이렇게 하니깐..https로 접속 하려 했더니 502가 뜨네요

ssl 설정은.....

 listen      443 ssl http2;
        server_name  aaaaaa.com
        client_max_body_size 100M;
        server_tokens off;

        ssl_certificate "/etc/letsencrypt/live/aaaaa.com/fullchain.pem";
        ssl_certificate_key "/etc/letsencrypt/live/aaaaa.com/privkey.pem";

        # ssl_dhparam "/etc/ssl/certs/dhparams.pem";
        # Set caches, protocols, and accepted ciphers. This config will merit an A+ SSL Labs score.

        ssl_session_cache shared:SSL:20m;
        ssl_session_timeout 10m;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
        ssl_ecdh_curve secp384r1;
      # ssl_prefer_s erver_ciphers on;
      ssl_ciphers 'ECDH+AESGCM:ECDH+AES256:ECDH+AES128:!ADH:!AECDH:!MD5';

      # Enable HSTS. This forces SSL on clients that respect it, most modern browsers. The includeSubDomains flag is optional
      add_header Strict-Transport-Security "max-age=31536000";

      ssl_trusted_certificate "/etc/letsencrypt/live/aaaaa.com/chain.pem";