globalsFetchEventprototypeFetchEvent.respondWith()Version: 3.45.0On this pageFetchEvent.respondWith() The respondWith() method allows you to provide a promise for a Response to send back to the client which made the incoming request to your application. Syntax respondWith(response) Parameters response : A Response or a Promise that resolves to a Response. Otherwise, a network error is returned to Fetch. Return value Always returns undefined.