Need HTTP_REFERER parameter

I am trying to move my PHP service to Cloudflare workers. In PHP the code is working fine, but while rewriting the code for Cloudflare workers, I am stuck.
Basically, my code will run on multiple workers environments, and depending upon the path used to call the service, my code will act differently. I was fetching called URL in php using below code. but in js code for workers, I am not getting what alternate code should I use.

$referer_url = filter_var( $_SERVER[‘HTTP_REFERER’], FILTER_SANITIZE_STRING );

I am using “itty-router” template for my wranger code

router.get('/', (request, env, context) => {
  const referer = request.headers.get('referer');

Thanks, it helped.

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