$http_referer problem

[safra]

Hi,

I have a problem with $http_referer. When I enter the page $http_referer contains the correct referal page. On the current page (a search results page) I have options to sort the contents of the page. When the page is reloaded after clicking a sort option $http_referer empty?

$http_referer is used as a way of security so it should contain the previous page (in this case the same page) otherwise the user is redirected to a page outside the secured folder. How can I fix this?

Thanks,