Nginx SSL proxy to squarespace.com site

I'm using SSL proxying to my squarespace.com site since they don't allow SSL. I was previously setting the HSTS header so I have some browsers that won't go to an HTTP version of my page. I need to use this proxy behavior to ensure they can still get to my page. Also, I want to make sure I haven't overlooked an issue with redirection looping.

Can I get some feedback about this configuration file, did I leave anything out or add anything in that shouldn't be there?

# HTTP redirect for www 
server {
    listen 80;

    server_name www.domain.com;
    return 301 http://domain.com$request_uri;
}

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

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

    server_name  domain.com;

    location / {
        proxy_set_header Host $host;
        proxy_pass http://192.168.2.100; # example IP, not my real IP
    }
}
# HTTPS Server

server {
    listen 443 ssl;

    ssl_certificate /etc/ssl/domain.com.chained.crt;
    ssl_certificate_key /etc/ssl/nginx.key;

    error_log /var/log/nginx/domain.error.log crit;

    server_name domain.com www.domain.com;
    location / {
        proxy_redirect off;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Host  $http_host;
        proxy_set_header X-NginX-Proxy    true;
        proxy_set_header Connection "";
        proxy_http_version 1.1;
        proxy_pass https://192.168.2.100; # example IP, not my real IP
    }
}