NGINX configuration for Dockerized Angular Universal app

nginx.conf

map $cache $expires {
    1 max;
    0 -1;
    default off;
}

map $uri $cache {
    "~*\.[0-9a-f]{8,32}\..*$" 1;
    ~* 0;
}

server {
    listen 443 ssl http2;
    server_name example.com www.example.com;

    expires $expires;

    location / {
        proxy_pass http://127.0.0.1:4000;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_http_version 1.1;
        proxy_set_header X-NginX-Proxy true;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_cache_bypass $http_upgrade;
        proxy_redirect off;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    location = /robots.txt {
        add_header Content-Type text/plain;
        return 200 "User-agent: *\nDisallow:\n";
    }

    location ~ /\. {
        deny all;
    }
}

server {
    listen 80;
    server_name example.com www.example.com;
    return 301 https://$host$request_uri;
}