How to make nginx proxy work

[rahulnjs]

I was trying to setup a domain for witty deployed on my instance.

Here is my nginx config,

server {
        server_name witty.xxx.xxx;

        location / {
                proxy_pass http://localhost:8080;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";
                proxy_read_timeout 3600;
        }

    listen 443 ssl; # managed by Certbot
    ssl_certificate fullchain.pem; # managed by Certbot
    ssl_certificate_key privkey.pem; # managed by Certbot
    include options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam ssl-dhparams.pem; # managed by Certbot

}

But I get 400 on /

Please let me know if I am missing something, or what would be the best way not to have to use the server ip to access it.

Thanks