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// 1. Register a FetchEvent listener that sends a custom
// response for the given request.
addEventListener('fetch', event => {
// 2. Return a custom request object
async function handleRequest(request) {
// Forward request to origin, get response.
let response = await fetch(request);
// Copy Response object so that we can edit headers.
response = new Response(response.body, response);
const country = request.headers.get('cf-ipcountry');
let expiryDate = new Date();
expiryDate.setTime(expiryDate.getTime() + (7*24*60*60*1000));
let expires = expiryDate.toUTCString();
const countryCookie = `universal_visitor_country=${country}; Expires=${expires}; Path=/; HttpOnly; SameSite=Lax; Secure`;
// Set cookie so that we don't add the headers
// next time.
response.headers.append('Set-Cookie', countryCookie);
// Return on to client.
return response;
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