Is it possible to use SERVER variables in templates?

[JamesAB]

I'm looking to do something like this PHP code:

PHP Code:

if ($_SERVER['SERVER_PORT'] != 443) {
   header("HTTP/1.1 301 Moved Permanently");
   header("Location: https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
   exit();
} 


But I would prefer to put it in individual templates because I only want to use it on a few pages.

Is there a "template friendly" version for similar code?
Or do I have to find a hook to place this sort of thing in?