I am trying to modify the 'has_js' cookie that is set by Drupal. I need to modify this cookie so it becomes both Http-only and secure in response to a site security review.

I attempted to add the following to the html.tpl.php file so the cookie would be modified before any output was rendered:


This gave me 2 has_js cookies, one with the desired modifications and one without.

I next attempted to grab the value from the original has_js cookie and then destroy it and replace it:

  $has = $_COOKIE['has_js']; //save cookie's value (i.e., '1')
  setcookie('has_js','',time()-3600); //destroy old cookie
  print_r("Not set");

This demonstrates (by the output I get) that at the start of html.tpl.php, the cookie isn't set -- which might explain why there are 2 cookies (perhaps I was creating a has_js cookie at one point in time and after that Drupal creates its own). Confusingly, if I simply do


at the same place in the file, 'has_js' cookie does show up with an assigned value of 1.

So my question is:

How can I find out when Drupal is setting this 'has_js' cookie and how can I add these attributes to it?

  • Drupal sets it in a core JS file (/misc/drupal.js)
    – thumbson
    Feb 20, 2015 at 14:57
  • Thank you. Do you know of a way to modify the cookie once it has been set without delving into core file changes?
    – 15shn
    Feb 23, 2015 at 17:02
  • You could try adding a custom js file that runs after the core file and set the cookie that way
    – thumbson
    Feb 24, 2015 at 5:29

1 Answer 1


I am answering this formally so other people can see one possible solution that will work if they have this same question, but the answer is actually found in the comment by @thumbson above: in order to modify the cookie, I did indeed find success in creating a custom js file that ran when every page loads.

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