// Fetch the request and pass it through the function
addEventListener('fetch', event => {
    event.respondWith(fetchAndApply(event.request))
});

async function fetchAndApply(request){

    let response = await fetch(request);
    response = new Response(response.body, response);
    
    // create header in format you like using `request.cf.*` fields - https://developers.cloudflare.com/workers/runtime-apis/request/#incomingrequestcfproperties
    response.headers.append("Set-Cookie", `llxp_geo_country=${request.cf.country}; path=/; secure; SameSite=None`);
    response.headers.append("Set-Cookie", `llxp_geo_region=${request.cf.regionCode}; path=/; secure; SameSite=None`);

    // assumes the worker sits in front of the site you're proxying, this fetch will go to the origin
    // if it doesn't, you may need to manipulate the URL here
    return response;
}

// Fetch the request and pass it through the function
addEventListener('fetch', event => {
    event.respondWith(fetchAndApply(event.request))
});

async function fetchAndApply(request){

    let response = await fetch(request);
    response = new Response(response.body, response);
    
    // create header in format you like using `request.cf.*` fields - https://developers.cloudflare.com/workers/runtime-apis/request/#incomingrequestcfproperties
    response.headers.append("Set-Cookie", `llxp_geo_country=${request.cf.country}; path=/; secure; SameSite=None`);
    response.headers.append("Set-Cookie", `llxp_geo_region=${request.cf.regionCode}; path=/; secure; SameSite=None`);

    // assumes the worker sits in front of the site you're proxying, this fetch will go to the origin
    // if it doesn't, you may need to manipulate the URL here
    return response;
}