worker.js

gistfile1.js

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

async function handleRequest(request) {

  const searchParams = new URL(request.url).searchParams

  let url = searchParams.get('url')
  if (url && !url.match(/^[a-zA-Z]+:\/\//)) url = 'http://' + url

  response = await fetch(url).then((response) => {
    return response;
  })

  var g = new Array();

  await new HTMLRewriter().on('#root-app > div > div.ui-pdp-container.ui-pdp-container--pdp > div > div.ui-pdp-container__col.col-1.ui-pdp-container--column-right.mt-20.mr-20 > div:nth-child(1) > div > div.ui-pdp-container__row.ui-pdp-container__row--highlighted-specs-res > div > div:nth-child(2) > span',
    {text(text) { console.log(text);g.push(text.text) }}).transform(response).text();

  return new Response(JSON.stringify({url: url,
                                      precio: g}, null, 2), {
    headers: { 'content-type': 'application/json;charset=UTF-8',
                 'Access-Control-Allow-Origin': '*',
                 'Access-Control-Allow-Headers': 'Content-Type' },
  })
}