Respond with another site

addEventListener('fetch', function(event) {
  event.respondWith(handleRequest(event.request))
})
async function handleRequest(request) {
  // Only GET requests work with this proxy.
  if (request.method !== 'GET') return MethodNotAllowed(request)
  return fetch(`https://example.com`)
}
function MethodNotAllowed(request) {
  return new Response(`Method ${request.method} not allowed.`, {
    status: 405,
    headers: {
      'Allow': 'GET'
    }
  })
}

​Demo

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