Random value in URL (avoiding cache)

Hello,

I am working with HTTP Advanced sensor. I am interested is it possible to add "random value" parameter to URL, in order to avoid response caching on web server side? For example, my URL is: http://www.demo.url/index.php?load_project=123. I would like to have it like this: http://www.demo.url/index.php?load_project=123&rand=99999 where 9999 is random value, generated on every sensor scan.

Thank you, Arturas