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我想在我的GWT Web應用程序中使用Firebase雲消息服務，但我遇到了一些問題。 應用程序應該能夠註冊Firebase服務工作者並使用其特定令牌連接到服務。這個令牌，收到的消息和令牌更改時的事件應該可以在我的GWT Java代碼中訪問。使用GWT時找不到Firebase Service Worker（404錯誤）
當我嘗試使用handle.getToken（）創建令牌時發生此錯誤。 我收到此錯誤信息：
A bad HTTP response code (404) was received when fetching the script. Failed to load resource: net::ERR_INVALID_RESPONSE browserErrorMessage: "Failed to register a ServiceWorker: A bad HTTP response code (404) was received when fetching the script." code: "messaging/failed-serviceworker-registration" message: "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)." stack: "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/3.5.2/firebase-messaging.js:41:225"__proto__: Error
嘗試訪問註冊服務工人的網址： http://127.0.0.1:11111/firebase-messaging-sw.js
所以很明顯的問題是，它試圖從我的本地主機地址訪問的JavaScript而不是其他Firebase JS文件的位置。所以我的問題是我如何改變它，所以它從正確的源加載文件？
這些腳本都包含在我的HTML文件：
<script src="https://www.gstatic.com/firebasejs/3.6.1/firebase.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.5.2/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.5.2/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.5.2/firebase-database.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.5.2/firebase-messaging.js"></script>
<script>
// Initialize Firebase
var config = {
apiKey: "AIzaSyBxdZNXHiLR1IC8Wrw3Y6q_5DFoN8hn_UY",
authDomain: "fir-test-848de.firebaseapp.com",
databaseURL: "https://fir-test-848de.firebaseio.com",
storageBucket: "fir-test-848de.appspot.com",
messagingSenderId: "974661154941"
};
firebase.initializeApp(config);
</script>
這是我的Java代碼：
public class FireBase
{
private JavaScriptObject _messagingHandle;
private String _token;
public FireBase()
{
_messagingHandle = createMessagingHandle();
requestPermission(_messagingHandle, this);
}
private native JavaScriptObject createMessagingHandle()
/*-{
return $wnd.firebase.messaging();
}-*/;
private native void listenTokenRefresh(final JavaScriptObject handle)
/*-{
handle.onTokenRefresh(function()
{
[email protected]::onTokenRefresh()();
});
}-*/;
private void onTokenRefresh()
{
getToken(_messagingHandle, this);
}
private native void requestPermission(final JavaScriptObject handle, final Object instance)
/*-{
handle.requestPermission().then(function()
{
$wnd.console.log('Notification permission granted.');
[email protected]::onPermission(Z)(true);
})
}-*/;
private void onPermission(final boolean granted)
{
if (granted)
{
getToken(_messagingHandle, this);
}
}
private native void getToken(final JavaScriptObject handle, final Object instance)
/*-{
handle.getToken().then(function(currentToken)
{
if (currentToken)
{
[email protected]::onTokenReceived(Ljava/lang/String;)(currentToken);
}
else
{
// Show permission request.
$wnd.console.log('No Instance ID token available. Request permission to generate one.');
[email protected]::onTokenReceived(Ljava/lang/String;)(null);
}
})
}-*/;
private void onTokenReceived(final String token)
{
if (token != null)
{
GWT.log("Received Token: " + token);
if (!token.equals(_token))
{
// Send/Update token to server
}
}
}
}
感謝您的信息。我不知道我必須自己實施服務人員。 – Roman
@Gaunt Face，你可以看看這個線程：http://stackoverflow.com/questions/42626375/set-up-firebase-javascript-to-use-with-ionic-serve我試着解決它按照你的指示，但我不明白爲什麼它應該工作，因爲「firebase-messaging-sw.js」是一個空殼。 – nyluje
它仍然需要firebase-messaging-sw.js文件來註冊推送的使用情況，但如果沒有任何內容添加到該文件，則用戶將收到來自Chrome的聲明「此應用在後臺更新」的通知。 –