我想在我的GWT web应用程序中使用firebase Cloud 消息传递服务，但我遇到了一些问题 . 应用程序应该能够注册firebase服务工作者并使用它的特定令牌连接到服务 . 此令牌，收到的消息和令牌更改时的事件应该可以在我的GWT Java代码中访问 .
当我尝试使用handle.getToken（）创建令牌时发生错误 . 我收到此错误消息：
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
它尝试访问以注册服务工作者的URL是：http://127.0.0.1:11111/firebase-messaging-sw.js
所以很明显问题是它试图从我的本地主机地址而不是其他firebase JS文件所在的位置访问javascript . 所以我的问题是如何更改它，以便从正确的源加载文件？
这些脚本包含在我的HTML文件中：
<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>
这是我的Java代码：
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()
{
instance.@x.client.miscellaneous.FireBase::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.');
instance.@x.client.miscellaneous.FireBase::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)
{
instance.@x.client.miscellaneous.FireBase::onTokenReceived(Ljava/lang/String;)(currentToken);
}
else
{
// Show permission request.
$wnd.console.log('No Instance ID token available. Request permission to generate one.');
instance.@x.client.miscellaneous.FireBase::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
}
}
}
}
3 回答
Firebase SDK尝试在特定位置注册服务工作者 .
位置是/firebase-messaging-sw.js . 有两种选择：
1.）使/ firebase-messaging-sw.js在浏览器中工作（即确保它返回有效的响应），然后再次尝试使用SDK（如果浏览器可以访问该文件，它应该可以工作） .
2.）使用
useServiceworker(<service worker registration>)方法传入自定义服务工作者 . 这仍然需要您拥有有效的服务工作者URL .只需在根文件夹firebase-messaging-sw.js中创建一个空文件
检查你的角度cli文件...添加
"firebase-messaging-sw.js", "manifest.json"
“assets”：[“assets”，“app / main / content / components / angular-material”，“favicon.ico”，“firebase-messaging-sw.js”，“manifest.json”]，