method Deno.RequestEvent.respondWith
RequestEvent.respondWith(r: Response | PromiseLike<Response>): Promise<void>
The method to be used to respond to the event. The response needs to
either be an instance of Response or a promise that resolves
with an instance of Response.
When the response is successfully processed then the promise returned will be resolved. If there are any issues with sending the response, the promise will be rejected.
Promise<void>