Customization Based on Client Geo Location

// Add a fetch event listener, which is triggered when a request is incoming. It uses the handleRequest function to handle requests and return responses.
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})
function handleRequest(request) {
    // Get the country code provided by EdgeOne.
    const countryCode = request.eo.geo.countryCodeAlpha2;
    // Select the corresponding language and welcome message based on the country code.
    let responseText;
    switch (countryCode) {
        case 'CN': // China
            responseText =`Hello user from China! Your latitude and longitude are ${request.eo.geo.latitude},${request.eo.geo.longitude}`;
            break;
        case 'KR': // South Korea
            responseText = `한국의 사용자님 반갑습니다! 당신의 위도와 경도는 ${request.eo.geo.latitude}와 ${request.eo.geo.longitude}입니다.`;
            break;
        case 'DE': // Germany
            responseText = `Willkommen in Deutschland! Ihre Breiten- und Längengrad sind ${request.eo.geo.latitude} und ${request.eo.geo.longitude}.`;
            break;
        case 'US': // USA
            responseText = `Hello from the USA! Your latitude and longitude are ${request.eo.geo.latitude} and ${request.eo.geo.longitude}.`;
            break;
        default: // Respond in English by default in other cases.
            responseText = `Welcome to our service! Your latitude and longitude are ${request.eo.geo.latitude} and ${request.eo.geo.longitude}.`;
            break;
    }
    // Return a response.
    return new Response(responseText, {
        headers: {
            'Content-Type': 'text/plain;charset=UTF-8'
        }
    })
}