Batch Redirect

// Add a fetch event listener, which is triggered when a request is incoming. It uses the handleRequest function to handle requests and return responses.
async function handleRequest(request) {
    // Define the target external host name.
    const yourExternalHostname = "www.example.com";
    // Create mapping from paths to redirect URLs.
    const redirectMap = new Map([
        ["/foo", "https://" + yourExternalHostname + "/redirect1"],
        ["/bar", "https://" + yourExternalHostname + "/redirect2"],
        ["/baz", "https://" + yourExternalHostname + "/redirect3"],
    ]);
    // Parse the request URL.
    const url = new URL(request.url);
    // Get the path part of the URL.
    const path = url.pathname;
    // Check whether the path is in the redirect mapping, and if so, perform a redirect.
    if (redirectMap.has(path)) {
        return Response.redirect(redirectMap.get(path), 301);
    } else {
        // If the path is not in the mapping, return a 404 status code.
        return new Response('Not Found', { status: 404 });
    }
}

// When a request event occurs, use the handleRequest function to handle it.
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request));
});