A ServiceWorker passed an opaque Response to FetchEvent.respondWith() while the FetchEvent.request.type was either "same-origin" or "cors". Opaque Response objects are only valid when the RequestMode is "no-cors".
FetchEvent.request.type이 "same-origin"이나 "cors"인 상태로 ServiceWorker가 FetchEvent.respondWith()에 opaque Response를 보냈습니다. Opaque Response 객체는 RequestMode가 "no-cors"일 때에만 유효합니다.