cdnjs-worker.js

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

async function fetchAndApply(request) {
  const requestURL = new URL(request.url)
  if(!requestURL.pathname.startsWith('/ajax/libs')) {
    requestURL.pathname = '/ajax/libs' + requestURL.pathname
    const newResponse = await fetch(requestURL, request)
    if(newResponse.status == 200) return newResponse
  }
  return fetch(request)
}