server {
    listen 80;
    server_name domain;
    ignore_invalid_headers off;
    client_max_body_size 0;
    proxy_buffering off;
    location / {
        proxy_pass http://site_name:9000;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Real-IP $remote_addr;
        # Default is HTTP/1, keepalive is only enabled in HTTP/1.1
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        chunked_transfer_encoding off;
    }
    listen 443 ssl;
    ssl_certificate /etc/letsencrypt/tmp/domain/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/tmp/domain/privkey.pem;
}