Final commit (be carefull and change the service worker/manifest to adapt to your server)

sw.js

@@ -20,6 +20,8 @@ self.addEventListener("fetch", event => {
          )
    );
 });
+
+/*
 function cache(request, response) {
    if (response.type === "error" || response.type === "opaque") {
       return Promise.resolve(); // do not put in cache network errors
@@ -29,6 +31,7 @@ function cache(request, response) {
       .open(CACHE_NAME)
       .then(cache => cache.put(request, response.clone()));
 }
+*/
 
 const CACHE_NAME = "V2";