Cloudflare Docs
Workers
Visit Workers on GitHub
Set theme to dark (⇧+D)

Bulk origin override

Resolve requests to your domain to a set of proxy third-party origin URLs.
export default {
async fetch(request) {
/**
* An object with different URLs to fetch
* @param {Object} ORIGINS
*/
const ORIGINS = {
'starwarsapi.yourdomain.com': 'swapi.dev',
'google.yourdomain.com': 'www.google.com',
};
const url = new URL(request.url);
// Check if incoming hostname is a key in the ORIGINS object
if (url.hostname in ORIGINS) {
const target = ORIGINS[url.hostname];
url.hostname = target;
// If it is, proxy request to that third party origin
return fetch(url.toString(), request);
}
// Otherwise, process request as normal
return fetch(request);
},
};
/**
* An object with different URLs to fetch
* @param {Object} ORIGINS
*/
const ORIGINS = {
'starwarsapi.yourdomain.com': 'swapi.dev',
'google.yourdomain.com': 'www.google.com',
};
function handleRequest(request) {
const url = new URL(request.url);
// Check if incoming hostname is a key in the ORIGINS object
if (url.hostname in ORIGINS) {
const target = ORIGINS[url.hostname];
url.hostname = target;
// If it is, proxy request to that third party origin
return fetch(url.toString(), request);
}
// Otherwise, process request as normal
return fetch(request);
}
addEventListener('fetch', event => {
event.respondWith(handleRequest(event.request));
});