Fetch real IP using proxy pass

I am attempting to fetch the real IP of the visitor on a Flask application that I am serving using Nginx server blocks on Ubuntu, but I get the same IP with all the visitors (my droplet’s IP). How do I fix this?

This is my current server config for my application.

server {
    listen 80;
    server_name subdomain.mysite.com;

    location / {
        proxy_pass http://0.0.0.0:8080;
        proxy_redirect http://0.0.0.0:8080 http://subdomain.mysite.com;

    }
}