Angular无法注册ServiceWorker:获取脚本时收到错误的HTTP响应代码(404) [英] Angular Failed to register a ServiceWorker: A bad HTTP response code (404) was received when fetching the script

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问题描述

我正在使用Firebase在Angular PWA中进行推送通知,并且正在跟踪链接。 。



单击允许按钮后,它在控制台上引发错误:


无法注册ServiceWorker:获取脚本时收到错误的HTTP响应代码(404)。
代码

消息/失败的serviceworker注册
消息

消息:我们无法注册默认服务工作者。无法注册ServiceWorker:获取脚本时收到错误的HTTP响应代码(404)。 (消息/失败的serviceworker注册)。
堆栈

FirebaseError:消息传递:我们无法注册默认服务人员。无法注册ServiceWorker:获取脚本时收到错误的HTTP响应代码(404)。 (消息/失败的服务工作人员注册)。请访问



我的应用程序和环境文件夹包含以下文件:



我的app.component.ts文件是

 从 @ angular / core导入{Component,OnInit}; 
进口*作为 firebase的firebase;
从 angularfire2 /数据库导入{AngularFireDatabase,AngularFireList};
//从 angularfire2 /已弃用数据库中导入{AngularFireDatabase,FirebaseListObservable,FirebaseObjectObservable};
从 ./push.service导入{PushService};

@Component({
选择器:'app-root',
templateUrl:'./app.component.html',
styleUrls:['./ app.component.scss']
})
出口类AppComponent {


//声明使用的变量
消息传递:任何
token:any //存储当前令牌ID实例生成的
项:AngularFireList< any []>
itemsDisplay:AngularFireList< any []> //可以在模板视图中看到的列表(可选。可以使用项本身)
itemsArr:any [] //存储从Firebase数据库中检索到的令牌ID
hideToken:boolean = false

//通知对象
pushData:任何= {
'notification':{
title: Background Message Title,
body: Background Message正文
},
to:
}

构造函数(公共db:AngularFireDatabase,私有pushService:PushService){

//创建一个可观察到的Firebase列表并调用其中的数据
this.itemsDisplay = db.list('/ items')

//声明消息传递$ b的属性值$ b this.messaging = firebase.messaging();

//检查令牌刷新
this.messaging.onTokenRefresh(function(){
this.messaging.getToken()
.then(function(refreshedToken) {
console.log('令牌刷新。');
})
.catch(function(err){
console.log('无法检索刷新的令牌', err);
});
});
// //分别获取Firebase数据并获取令牌ID值
this.itemsArr = [] //重新初始化数组以防止数据重复
this.items = this.db.list(' / items');
this.items.valueChanges()。subscribe(snapshots => {

console.log(snapshots);
//snapshots.forEach(snapshot => {
// console.log(嘿,快照... +快照);
// this.itemsArr.push(snapshot);
//});
});
// console.log(this.itemsArr)
}

//检查令牌订阅中的重复项
checkToken(token,arr){
console.log(内部检查令牌功能)
console.log(arr)
console.log(令牌)
让计数器:number = 0
for(var i = 0; i< arr.length; i ++){
if(arr [i] ===令牌){
counter ++
}
}
console.log (计数器值,计数器)
返回计数器
}

//通过事件生成推送
generatePush(){
console.log( 内部推送功能)
console.log(this.pushData.to)
if(this.pushData.to ===){
console.log(没有可用令牌)
return
}
this.pushService.generatePush(this.pushData)
.subscribe(data => {console.log(成功发布)}},错误=> console.log(err))
}

//从Firebase数据库获取数据的功能
getDataF romFb(){
this.hideToken = true
}

ngOnInit(){
//提示用户授予加载组件通知的权限
const self = this
this.items = this.db.list('/ items')
this.messaging.requestPermission()
.then(function(){
控制台.log('已授予通知权限。');
self.messaging.getToken()
.then(function(currentToken){
if(currentToken){
self.token = currentToken
self.pushData.to = self.token
console.log(self.pushData.to)

//设置超时时间以使所有数据都能被加载
setTimeout(()= > {
if(self.checkToken(self.token,self.itemsArr)=== 0){
console.log(推送事件)
// self.items。 push({tokenID:currentToken})
} else {
console.log(用户已被订阅)
}
},6500)
//显示当前令牌数据
console.log( currentToken:,currentToken);
console.log(存储令牌:,self.token);
} else {
//显示权限请求。 console.log(’没有可用的实例ID令牌。请求获得生成权限的权限。’);
}
})
.catch(function(err){
console.log('检索令牌时发生错误。',err);
}) ;
}}
.catch(function(err){
console.log('无法获得通知权限。',err);
})

//处理传入的消息。在以下情况下调用:
//-当应用程序将焦点移至
//时收到一条消息//用户单击由服务工作人员 messaging.setBackgroundMessageHandler处理程序创建的应用程序通知。
this.messaging.onMessage(function(payload){
console.log(收到邮件。,有效载荷);
});
}

}

我的firebase-messaging-sw。 js文件是:

  importScripts('https://www.gstatic.com/firebasejs/3.5.0/firebase-app .js'); 
importScripts(’https://www.gstatic.com/firebasejs/3.5.0/firebase-messaging.js’);

firebase.initializeApp({
messagingSenderId':'850143277209'//再次运行它会显示错误
});

var messages = firebase.messaging();
currentMessage = new BehaviorSubject(null);

//处理后台通知

//如果要自定义在后台收到的通知(Web应用程序已关闭或不在浏览器焦点中),则应该实现此可选方法
messages.setBackgroundMessageHandler(function(payload){
console.log('[firebase-messaging-sw.js]收到背景消息',有效负载);
//自定义这里的通知
var notificationTitle ='背景消息标题';
var notificationOptions = {
正文:'背景消息正文。'

};

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




});

我的Angular.json文件为:

  {
$ schema: ./node_modules/@angular/cli/lib/config/schema.json,
version:1 ,,
newProjectRoot:项目,
项目:{
beautyOfSoul:{
root:,
sourceRoot: src ,
projectType:应用程序,
前缀: app,
schematics:{
@ schematics / angular:component:{
styleext: scss
}
},
architect:{
build:{
builder: @angular -devkit / build-angular:browser,
选项:{
outputPath: dist / beautyOfSoul,
index: src / index.html,
main: src / main.ts,
polyfills: src / polyfills.ts,
tsConfig: src / tsconfig.app.json,
资产:[
src / favicon.ico,
src / assets,
src / assets / manifest.json,
src / manifest.json,
src / firebase-messaging-sw.js
] ,
样式:[
src / styles.scss
],
脚本:[]
},
配置 :{{
制作:{
fileReplacements:{
替换: src / environments / environment.ts,
with: src / environments /environment.prod.ts
}],
optimization:true,
outputHashing: all,
sourceMap:false,
extractCss:true,
namedChunks:false,
aot:正确,
extractLicenses:正确,
vendorChunk:错误,
buildOptimizer:正确,
serviceWorker:正确
}
}
},
serve:{
builder: @ angular-devkit / build-angular:dev-server,
options:{
browserTarget: beautyOfSoul:build
},
configuration:{
production:{
browserTarget:灵魂之美:build:production
}
}
},
extract-i18n:{
builder: @ angular-devkit / build-angular: extract-i18n,
选项:{
browserTarget: beautyOfSoul:build
}
},
test:{
builder: @ angular-devkit / build-angular:karma,
options:{
main: src / test.ts,
polyfills : src / polyfills.ts,
tsConfig: src / tsconfig.spec.json,
karmaConfig: src / karma.conf.js,
样式:[[
src / styles.scss
],
脚本:[],
资产:[
src / favicon.ico,
src / assets,
src / manifest.json,
src / firebase-messaging-sw.js
]
}
},
lint:{
builder: @ angular-devkit / build-angular:tslint,
options:{
tsConfig:[
src / tsconfig.app.json,
src / tsconfig.spec.json
],
排除: [
** / node_modules / **
]
}
}
}
},
beautyOfSoul-e2e: {
root: e2e /,
projectType: application,
architect:{
e2e:{
builder: @ angular-devkit / build-angular:protractor,
options:{
protractorConfig: e2e / protractor.conf.js,
devServerTarget: beautyOfSoul:serve
},
configuration:{
production:{
devServerTarget: beautyOfSoul:serve:production
}
}
},
lint:{
builder: @ angular-devkit / build-angular:tslint,
options:{
tsConfig: e2e / tsconfig.e2e.json,
exclude:[
** / node_modules / **
]
}
}
}
}
},
defaultPr oject: beautyOfSoul
}

我的网络标签为:
< a href = https://i.stack.imgur.com/OqCvU.png rel = nofollow noreferrer>



我的服务人员标签为:



解决方案

我在React项目中遇到了类似的问题,对我来说解决方案是手动将我自己的js文件注册为服务工作者。

  navigator.serviceWorker.register('./ your-serviceworker-file.js ')
.then((registration)=> {
messages.useServiceWorker(registration);

//请求权限并获得令牌。....
});

在firebase初始化中运行该代码为我解决了这个问题。


I am doing Push notifications in Angular PWA with Firebase and I am following a link to do so. https://medium.com/@tariqueejaz/progressive-web-app-push-notifications-making-the-web-app-more-native-in-nature-a167af22e004

I am using Angular 6 and have setup the code for everything. when I am trying to run it, then it is showing me a pop up .

After clicking on Allow button, it is throwing an error on console:

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 http://localhost:4200/vendor.js:106604:32↵ at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (http://localhost:4200/polyfills.js:2710:26)↵ at Object.onInvoke (http://localhost:4200/vendor.js:35701:33)↵ at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (http://localhost:4200/polyfills.js:2709:32)↵ at Zone.push../node_modules/zone.js/dist/zone.js.Zone.run (http://localhost:4200/polyfills.js:2460:43)↵ at http://localhost:4200/polyfills.js:3194:34↵ at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (http://localhost:4200/polyfills.js:2743:31)↵ at Object.onInvokeTask (http://localhost:4200/vendor.js:35692:33)↵ at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (http://localhost:4200/polyfills.js:2742:36)↵ at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (http://localhost:4200/polyfills.js:2510:47)" proto : Error

My project Structure is:

My app and environment folder consists of following files:

My app.component.ts file is

import {Component, OnInit} from '@angular/core';
import * as firebase from 'firebase';
import {AngularFireDatabase, AngularFireList} from 'angularfire2/database';
//import {AngularFireDatabase, FirebaseListObservable, FirebaseObjectObservable} from 'angularfire2/database-deprecated';
import {PushService} from './push.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {


  // Declare the variables used
  messaging: any
  token: any  // Stores the current token ID instance generated
  items: AngularFireList<any[]>
  itemsDisplay: AngularFireList<any[]> // List observable for template view (Optional. items itself can be used)
  itemsArr: any[] // Stores the token IDs retrieved from the firebase database 
  hideToken: boolean = false

  // Notificayion object
  pushData: any = {
    'notification': {
      "title": "Background Message Title",
      "body": "Background Message Body"
    },
    "to": ""
  }

  constructor(public db: AngularFireDatabase, private pushService: PushService) {

    // Creates a Firebase List Observable and calls the data in it
    this.itemsDisplay = db.list('/items')

    // Declaring the property value of messaging
    this.messaging = firebase.messaging();

    // Check for token refresh
    this.messaging.onTokenRefresh(function() {
      this.messaging.getToken()
        .then(function(refreshedToken) {
          console.log('Token refreshed.');
        })
        .catch(function(err) {
          console.log('Unable to retrieve refreshed token ', err);
        });
    });
    // Obtaining the firebase data and retrieving token ID values separately
    this.itemsArr = []  // Reinitialize the array to prevent data duplication
    this.items = this.db.list('/items');
    this.items.valueChanges().subscribe(snapshots => {

      console.log(snapshots);
      //snapshots.forEach(snapshot => {
      //  console.log("Hey ,, snapshot......"+snapshot);
      //  this.itemsArr.push(snapshot);
      // });
    });
    // console.log(this.itemsArr)
  }

  // Check for duplicates in token subscription
  checkToken(token, arr) {
    console.log("Inside check token function")
    console.log(arr)
    console.log(token)
    let counter: number = 0
    for (var i = 0; i < arr.length; i++) {
      if (arr[i] === token) {
        counter++
      }
    }
    console.log("Counter value", counter)
    return counter
  }

  // Generate Push through an event
  generatePush() {
    console.log("Inside push function")
    console.log(this.pushData.to)
    if (this.pushData.to === "") {
      console.log("No token available")
      return
    }
    this.pushService.generatePush(this.pushData)
      .subscribe(data => {console.log("Succesfully Posted")}, err => console.log(err))
  }

  // Function to get the data from Firebase Database
  getDataFromFb() {
    this.hideToken = true
  }

  ngOnInit() {
    // Prompt user to grant permission for notifications on loading components
    const self = this
    this.items = this.db.list('/items') 
    this.messaging.requestPermission()
      .then(function() {
        console.log('Notification permission granted.');
        self.messaging.getToken()
          .then(function(currentToken) {
            if (currentToken) {
              self.token = currentToken
              self.pushData.to = self.token
              console.log(self.pushData.to)

              // Set a timeout so as to enable all the data to be loaded
              setTimeout(() => {
                if (self.checkToken(self.token, self.itemsArr) === 0) {
                  console.log("Push occurrence")
                  // self.items.push({tokenID: currentToken})
                } else {
                  console.log("User is already subscribed")
                }
              }, 6500)
              // Displays the current token data
              console.log("currentToken: ", currentToken);
              console.log("Stored token: ", self.token);
            } else {
              // Show permission request.
              console.log('No Instance ID token available. Request permission to generate one.');
            }
          })
          .catch(function(err) {
            console.log('An error occurred while retrieving token.', err);
          });
      })
      .catch(function(err) {
        console.log('Unable to get permission to notify. ', err);
      })

    // Handle incoming messages. Called when:
    // - a message is received while the app has focus
    // - the user clicks on an app notification created by a sevice worker `messaging.setBackgroundMessageHandler` handler.
    this.messaging.onMessage(function(payload) {
      console.log("Message received. ", payload);
    });
  }

}

My firebase-messaging-sw.js file is:

importScripts('https://www.gstatic.com/firebasejs/3.5.0/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/3.5.0/firebase-messaging.js');

firebase.initializeApp({
  'messagingSenderId': '850143277209' // run it again show me error
});

var messaging = firebase.messaging();
currentMessage = new BehaviorSubject(null);

// Handle Background Notifications

// If you would like to customize notifications that are received in the background (Web app is closed or not in browser focus) then you should implement this optional method
messaging.setBackgroundMessageHandler(function (payload) {
  console.log('[firebase-messaging-sw.js] Received background message ', payload);
  // Customize notification here
  var notificationTitle = 'Background Message Title';
  var notificationOptions = {
    body: 'Background Message body.'

  };

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




});

My Angular.json file is:

{
    "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
    "version": 1,
    "newProjectRoot": "projects",
    "projects": {
        "beautyOfSoul": {
            "root": "",
            "sourceRoot": "src",
            "projectType": "application",
            "prefix": "app",
            "schematics": {
                "@schematics/angular:component": {
                    "styleext": "scss"
                }
            },
            "architect": {
                "build": {
                    "builder": "@angular-devkit/build-angular:browser",
                    "options": {
                        "outputPath": "dist/beautyOfSoul",
                        "index": "src/index.html",
                        "main": "src/main.ts",
                        "polyfills": "src/polyfills.ts",
                        "tsConfig": "src/tsconfig.app.json",
                        "assets": [
                            "src/favicon.ico",
                            "src/assets",
                            "src/assets/manifest.json",
                            "src/manifest.json",
                            "src/firebase-messaging-sw.js"
                        ],
                        "styles": [
                            "src/styles.scss"
                        ],
                        "scripts": []
                    },
                    "configurations": {
                        "production": {
                            "fileReplacements": {
                                "replace": "src/environments/environment.ts",
                                "with": "src/environments/environment.prod.ts"
                            }],
                            "optimization": true,
                            "outputHashing": "all",
                            "sourceMap": false,
                            "extractCss": true,
                            "namedChunks": false,
                            "aot": true,
                            "extractLicenses": true,
                            "vendorChunk": false,
                            "buildOptimizer": true,
                            "serviceWorker": true
                        }
                    }
                },
                "serve": {
                    "builder": "@angular-devkit/build-angular:dev-server",
                    "options": {
                        "browserTarget": "beautyOfSoul:build"
                    },
                    "configurations": {
                        "production": {
                            "browserTarget": "beautyOfSoul:build:production"
                        }
                    }
                },
                "extract-i18n": {
                    "builder": "@angular-devkit/build-angular:extract-i18n",
                    "options": {
                        "browserTarget": "beautyOfSoul:build"
                    }
                },
                "test": {
                    "builder": "@angular-devkit/build-angular:karma",
                    "options": {
                        "main": "src/test.ts",
                        "polyfills": "src/polyfills.ts",
                        "tsConfig": "src/tsconfig.spec.json",
                        "karmaConfig": "src/karma.conf.js",
                        "styles": [
                            "src/styles.scss"
                        ],
                        "scripts": [],
                        "assets": [
                            "src/favicon.ico",
                            "src/assets",
                            "src/manifest.json",
                            "src/firebase-messaging-sw.js"
                        ]
                    }
                },
                "lint": {
                    "builder": "@angular-devkit/build-angular:tslint",
                    "options": {
                        "tsConfig": [
                            "src/tsconfig.app.json",
                            "src/tsconfig.spec.json"
                        ],
                        "exclude": [
                            "**/node_modules/**"
                        ]
                    }
                }
            }
        },
        "beautyOfSoul-e2e": {
            "root": "e2e/",
            "projectType": "application",
            "architect": {
                "e2e": {
                    "builder": "@angular-devkit/build-angular:protractor",
                    "options": {
                        "protractorConfig": "e2e/protractor.conf.js",
                        "devServerTarget": "beautyOfSoul:serve"
                    },
                    "configurations": {
                        "production": {
                            "devServerTarget": "beautyOfSoul:serve:production"
                        }
                    }
                },
                "lint": {
                    "builder": "@angular-devkit/build-angular:tslint",
                    "options": {
                        "tsConfig": "e2e/tsconfig.e2e.json",
                        "exclude": [
                            "**/node_modules/**"
                        ]
                    }
                }
            }
        }
    },
    "defaultProject": "beautyOfSoul"
}

My Network tab is:

My service worker tab is:

解决方案

I got a similar issue in React project, and for me the solution was to manually register my own js file as a serviceworker.

navigator.serviceWorker.register('./your-serviceworker-file.js')
.then((registration) => {
  messaging.useServiceWorker(registration);

  // Request permission and get token.....
});

Running that code in the firebase initialization solved the issue for me.

这篇关于Angular无法注册ServiceWorker:获取脚本时收到错误的HTTP响应代码(404)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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