Use it for local site development and to fetch media files from prod site.

prod-assets-in-local-nginx.conf

# Proxy uploads from production
location ~* \.(js|css|png|jpg|jpeg|gif|ico|mp3|mov|tif|tiff|swf|txt|html|svg)$ {
    expires 24h;
    log_not_found off;
    try_files $uri $uri/ @production;
}
location @production {
    resolver 8.8.8.8;
    proxy_pass {prod_url}/$uri;
}