A Cloudflare worker to redirect image requests from dickhead content scraper's site to a Rick Roll

rick-roll-content-scraper.js

addEventListener('fetch', event => {
  event.respondWith(fetchAndApply(event.request))
})

async function fetchAndApply(request) {
  let response = await fetch(request)

  let referer = request.headers.get('Referer')
  let contentType = response.headers.get('Content-Type') || ''
  if (referer && contentType.startsWith('image/')) {
    if (new URL(referer).hostname === new URL('https://laptrinhx.com/').hostname) {
      return Response.redirect('https://files.troyhunt.com/RickRoll.gif', 302)
    }
  }

  return response
}