I can't get token

[MiloslavKrejza]

hello i can't get token from a database

"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)."

What can i do to fix this?

[annetters]

I am also having this issue. This comes up on Step 9 of the tutorial, right after you ask the user to accept notifications.
As a user, I receive the request to Get Notifications and hit Accept. Afterwards, the console reads:

A bad HTTP response code (404) was received when fetching the script. :5001/__/firebase/3.8.0/firebase-app.js 

Failed to load resource: net::ERR_INVALID_RESPONSE firebase-messaging-sw.js:1 

Uncaught [object DOMException] (anonymous) @ firebase-messaging-sw.js:1
main.js:237 

Unable to get messaging token. e {code: "messaging/failed-serviceworker-registration", message: "Messaging: We are unable to register the default s…ed (messaging/failed-serviceworker-registration).", 

browserErrorMessage: "Failed to register a ServiceWorker: ServiceWorker script evaluation failed", stack: "FirebaseError: Messaging: We are unable to registe….gstatic.com/firebasejs/3.8.0/firebase.js:544:225"}
(anonymous) @ main.js:237

[surazzarus]

I am having the same problem. Could anyone find the solution for this? Thanks

[Krupen]

After spending lot of time, I found a solution. This is something that they din't put up in the documentation.

You need to add firebase-messaging-sw.js named file with following content to your root (/public) directory
`

importScripts('https://www.gstatic.com/firebasejs/4.1.1/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/4.1.1/firebase-messaging.js');
importScripts('https://www.gstatic.com/firebasejs/4.1.1/firebase.js');


var config = {
    apiKey: "<APIKEY>",
    authDomain: "<PROJECTID>.firebaseapp.com",
    databaseURL: "https://<DATABASE NAME>.firebaseio.com",
    projectId: "<PROJECT ID>",
    storageBucket: "<PROJECT ID>.appspot.com",
    messagingSenderId: "<SENDER ID>"
};
firebase.initializeApp(config);
const messaging = firebase.messaging();

messaging.setBackgroundMessageHandler(function(payload) {
    console.log('[firebase-messaging-sw.js] Received background message ', payload);
    // Customize notification here
    const notificationTitle = 'Background Message Title';
    const notificationOptions = {
        body: 'Background Message body.',
        icon: '/firebase-logo.png'
    };

return self.registration.showNotification(notificationTitle,
    notificationOptions);
});

`

[kroikie]

This issue was moved to firebase/codelab-friendlychat-android#4

[jenvigo]

After spending lot of time, I found a solution. This is something that they din't put up in the documentation.

You need to add firebase-messaging-sw.js named file with following content to your root (/public) directory `

importScripts('https://www.gstatic.com/firebasejs/4.1.1/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/4.1.1/firebase-messaging.js');
importScripts('https://www.gstatic.com/firebasejs/4.1.1/firebase.js');


var config = {
    apiKey: "<APIKEY>",
    authDomain: "<PROJECTID>.firebaseapp.com",
    databaseURL: "https://<DATABASE NAME>.firebaseio.com",
    projectId: "<PROJECT ID>",
    storageBucket: "<PROJECT ID>.appspot.com",
    messagingSenderId: "<SENDER ID>"
};
firebase.initializeApp(config);
const messaging = firebase.messaging();

messaging.setBackgroundMessageHandler(function(payload) {
    console.log('[firebase-messaging-sw.js] Received background message ', payload);
    // Customize notification here
    const notificationTitle = 'Background Message Title';
    const notificationOptions = {
        body: 'Background Message body.',
        icon: '/firebase-logo.png'
    };

return self.registration.showNotification(notificationTitle,
    notificationOptions);
});

`

This is not working for me... Actually, the file is being generated after building the project.