Cloudflare worker

worker.js

function getCookie(request, name) {
  let result = null;
  let cookieString = request.headers.get('Cookie');
  if (cookieString) {
    let cookies = cookieString.split(';')
    cookies.forEach(cookie => {
      let cookieName = cookie.split('=')[0].trim()
      if (cookieName === name) {
        let cookieVal = cookie.split('=')[1]
        result = cookieVal
      }
    })
  }
  return result
}

async function handleRequest(request) {
  let cookie = getCookie(request, '__BANKED-DEBUG')
  if (cookie && cookie === 'TRUE') {
    return Response('[banked-debug.js]')
  }
  return Response('[banked.js]')
}
addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})