How can I configure Nginx on HA installed on another Raspberry pi 3 B+?

Configuration
9

You only have ONE URL. The point of the reverse proxy is to only expose the reverse proxy, not the direct connection to the server being proxied.

of course

Here is a WORKING config that I use:

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

server {
    # Update this line to be your domain
    server_name domain.com;

    # These shouldn't need to be changed
    listen 80;
    return 301 https://$host$request_uri;
}

server {
    # Update this line to be your domain
    server_name domain.com;

    # Ensure these lines point to your SSL certificate and key
    ssl_certificate /etc/letsencrypt/live/domain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/domain.com/privkey.pem;

    # Ensure this line points to your dhparams file
    ssl_dhparam /etc/nginx/ssl/dhparams.pem;


    # These shouldn't need to be changed
    listen 443 http2; # if your nginx version is >= 1.9.5 you can also add the "http2" flag here
    #listen 80 http2;
    add_header Strict-Transport-Security "max-age=31536000; includeSubdomains";
    ssl on;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    access_log /var/log/nginx/hass.access.log;
    error_log /var/log/nginx/hass.error.log;

    proxy_buffering off;

    location / {
        proxy_pass http://homeassistant.ip.address:8123;
        proxy_set_header Host $host;
        proxy_redirect http:// https://;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }
}
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