workers.js

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

async function fetchAndApply(request) {

   const country = request.headers.get('Cf-Ipcountry').toLowerCase() 
   let url = new URL(request.url)

   const target_url = 'https://' + url.hostname + '/' + country
   const target_url_response = await fetch(target_url)

   if(target_url_response.status === 200) {
       return new Response('', {
         status: 302,
         headers: {
           'Location': target_url
         }
       })     
   } else {
       return fetch(request)
   }
}