nginx configuration for yjs over https reverse proxy

myserver.conf

server {
        listen 80 ;
        # listen [::]:80 ipv6only=on;

        root /var/www/html;
        index index.php index.html index.htm;

        server_name y.relm.us;

        location / {
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $host;
                proxy_pass http://localhost:1235;

                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "Upgrade";
                proxy_connect_timeout 7d;
                proxy_send_timeout 7d;
                proxy_read_timeout 7d;
        }

        error_page 404 /404.html;
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
                root /usr/share/nginx/html;
        }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/y.relm.us/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/y.relm.us/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}