server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;
    charset utf-8;
    server_tokens off;

    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "DENY" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
    add_header Content-Security-Policy "default-src 'self'; base-uri 'self'; form-action 'none'; frame-ancestors 'none'; script-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data:; connect-src 'self'" always;

    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css application/javascript application/json application/manifest+json image/svg+xml;

    location = /healthz {
        access_log off;
        default_type text/plain;
        return 200 "ok\n";
    }

    location = /index.html {
        expires -1;
        try_files $uri =404;
    }

    location ~* \.(?:css|js|png|jpe?g|gif|svg|ico|webmanifest)$ {
        expires 1h;
        try_files $uri =404;
    }

    location / {
        try_files $uri $uri/ =404;
    }

    error_page 404 /404.html;

    location = /404.html {
        internal;
    }
}