location @backend {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_hide_header X-Powered-By;
    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_connect_timeout       600;
    proxy_send_timeout          600;
    proxy_read_timeout          600;
    send_timeout                600;
    proxy_pass http://127.0.0.1:3090;
    proxy_pass_request_headers  on;
    proxy_http_version 1.1;
    proxy_set_header Connection "";
    expires -1;
  }