Cloudflare worker to proxy requests (any HTTP method) to a different origin

cloudflare_worker_to_proxy_requests.js

const base = "https://newsubdomain.example.com"

async function handleRequest(request) {
    // Make a copy to allow mutation.
    request = new Request(request);

    // To override default caching mechanism and respect Cache-Control.
    request.cf.cacheEverything = true;

    // Extract path from request URL.
    const url = new URL(request.url);
    const { pathname, search } = url;

    const originUrl = base + pathname + search;
    const response = await fetch(originUrl, request);
    return response;
}

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