nginx openslides reverse proxy configuration TLS

openslides

server {                                                                                                             
    access_log off;
    listen 80 default_server;
    listen [::]:80 default_server;
   # enforce https
    return 301 https://$host$request_uri;
}

server {                                                                                                             
    access_log off;
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name <DOMAINNAME>;

    ssl_certificate /etc/letsencrypt/live/<DOMAINNAME>/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/<DOMAINNAME>/privkey.pem;

    # intermediate configuration
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;

    client_max_body_size 128M;

    location /ws/ {
        proxy_pass http://127.0.0.1:8000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $host;
    }

    location / {
        proxy_pass_header Server;
        proxy_set_header Host $http_host;
        proxy_redirect off;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Scheme $scheme;
        proxy_pass http://127.0.0.1:8000/;
    }
}