nextcloud_nginx-proxy.conf

server {
        listen 443 ssl;
        server_name nextcloud nextcloud.mydomain.com;

        access_log /var/log/nginx/nextcloud.mydomain.com.access.log;
        error_log /var/log/nginx/nextcloud.mydomain.com.error.log;

        client_max_body_size 0;
        underscores_in_headers on;

        ssl_stapling on;
        ssl_stapling_verify on;

        location / {
                auth_basic "Administrator Login";
                auth_basic_user_file /config/nginx/.htpasswd;
                proxy_headers_hash_max_size 512;
                proxy_headers_hash_bucket_size 64;
                proxy_set_header Host $host;
                proxy_set_header X-Forwarded-Proto $scheme;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

                add_header Front-End-Https on;
                # whatever the IP of your cloud server is
                proxy_pass http://nextcloud:9000/;
        }
}