我们无法注册默认服务人员

Question

我有firebase-messaging-sw.js文件，该文件在网络中可见，并且也在控制台中记录了消息。但是我现在越来越：

An error occurred while retrieving token.  FirebaseError: Messaging: We are unable to register the default service worker. Failed to register a ServiceWorker: A bad HTTP response code (404) was received when fetching the script. (messaging/failed-serviceworker-registration).
    at https://www.gstatic.com/firebasejs/6.6.1/firebase-messaging.js:1:29909:

我试图检查控制台并进行调试，但不确定是什么错误。

firebase-messaging-sw.js文件包含：

importScripts('https://www.gstatic.com/firebasejs/4.1.3/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/4.1.3/firebase-messaging.js');
console.log("in sw page");

index.html具有：

firebase.initializeApp({
                apiKey: "XXXXXX",
                authDomain: "XXXX-XXXXX.firebaseapp.com",
                databaseURL: "XXXXXXX",
                projectId: "XXXXXX",
                storageBucket: "",
                messagingSenderId: "XXXXXXX",
                appId: "XXXXX"
              });
                //  // Initialize Firebase
                const messaging = firebase.messaging();
            Notification.requestPermission().then((permission) => {
              if (permission === 'granted') {
                navigator.serviceWorker.register('firebase-messaging-sw.js')
                console.log('Notification permission granted.');
                    messaging.getToken().then((currentToken) => {
                      if (currentToken) {
                        console.log(currentToken);
                      } else {
                        // Show permission request.
                        console.log('No Instance ID token available. Request permission to generate one.');

                      }
                    }).catch((err) => {
                      console.log('An error occurred while retrieving token. ', err);
                    });
              } else {
                console.log('Unable to get permission to notify.');
              }
            });

我希望用户单击“允许”后会获得令牌。 可能是什么原因？还有解决方案吗？