nginx.conf

server {
    listen 80;
    server_name example.com;

    root /usr/share/nginx/html;
    index index.html;

    gzip on;
    gzip_types text/plain text/css application/javascript application/json application/xml application/xml+rss text/javascript;
    gzip_min_length 1000;

    location ~* \.(jpg|jpeg|png|gif|svg|ico|css|js|woff|woff2|ttf|eot)$ {
        expires 30d;
        add_header Cache-Control "public, no-transform";
    }

    location / {
        try_files $uri $uri/ /index.html;
    }

location /env.js {
    root /usr/share/nginx/html;
    add_header Cache-Control "no-cache, no-store, must-revalidate";
    add_header Pragma "no-cache";
    add_header Expires 0;
    try_files $uri =404;
}

    error_page 404 /index.html;

    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header Referrer-Policy "strict-origin-when-cross-origin";
}