Nginx Reverse Proxy для Node.js и Next.js с WebSocket, HTTP/2 и SSL

# /etc/nginx/sites-available/app.example.com.conf
upstream nextjs_upstream {
    server 127.0.0.1:3000;
    keepalive 64;
}

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

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

    ssl_certificate /etc/letsencrypt/live/app.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/app.example.com/privkey.pem;

    client_max_body_size 32M;

    # Кэширование статических ассетов Next.js
    location /_next/static {
        alias /var/www/app.example.com/.next/static;
        expires 365d;
        add_header Cache-Control "public, max-age=31536000, immutable";
        access_log off;
    }

    # Статические файлы из папки public/
    location /static {
        alias /var/www/app.example.com/public;
        expires 30d;
        access_log off;
    }

    # Основное проксирование в Node.js / Next.js
    location / {
        proxy_pass http://nextjs_upstream;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        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_cache_bypass $http_upgrade;
        proxy_read_timeout 60s;
    }
}