I'm trying to make the service worker in angular work with API requests. I'd like the app to work offline and I've the below config:

    {
        "name": "api",
        "urls": ["/**"],
        "cacheConfig": {
            "strategy": "performance",
            "maxSize": 20,
            "maxAge": "365d",
            "timeout": "5s"
        }
    }

Here is what the xhr tab looks like when I'm offline:

and this is the content of the user request:

As you can see the API calls for user don't resolve.

This is what the response of user looks like when online:

I'm trying to make the service worker in angular work with API requests. I'd like the app to work offline and I've the below config:

    {
        "name": "api",
        "urls": ["https://x./**"],
        "cacheConfig": {
            "strategy": "performance",
            "maxSize": 20,
            "maxAge": "365d",
            "timeout": "5s"
        }
    }

Here is what the xhr tab looks like when I'm offline:

and this is the content of the user request:

As you can see the API calls for user don't resolve.

This is what the response of user looks like when online:

• javascript
• angular
• service-worker
• angular5
• angular-service-worker

4 Answers 4

Try this:

• Go to your application tab -> Clear Storage -> Clear Site Data.

• Change your DataGroups array from this:

  {
      "name": "api",
      "urls": ["https://x./**"],
      "cacheConfig": {
          "strategy": "performance",
          "maxSize": 20,
          "maxAge": "365d",
          "timeout": "5s"
      }
  }
  

To this:

"dataGroups": [
    {
      "name": "api-performance",
      "urls": [
        "/user" //<=========== I know you want all API calls to be cached, but try this first and see
      ],
      "cacheConfig": {
        "strategy": "performance",
        "maxSize": 100,
        "maxAge": "3d"
      }
    }
  ]

• save and build your app in PROD,
• visit the page the first time.
• disable network
• refresh your page

if you are using "strategy": "performance" remove timeout property

To handle API data offline you have to use Offline Storage (that is store data in web browser after initial API call), recently I have used Local Forage in my application. Find the linkS below:

https://github./Alorel/ngforage#types-and-polyfills

https://developers.google./web/fundamentals/instant-and-offline/web-storage/offline-for-pwa

"dataGroups": [
    {

        "name": "TestApi",
        "urls": [
            "https://api.chucknorris.io/jokes/random",
            "https://localhost:4377/api/home/getNames/"
        ],
        "cacheConfig": {
            "strategy": "freshness",
            "maxSize": 20,
            "maxAge": "1h",
            "timeout": "5s"
        }
    },
    {
        "name": "TestAPI",
        "urls": [
            "https://localhost:4377/api/test/getList",
            "https://localhost:4377/api/template/start/"
        ],
        "cacheConfig": {
            "strategy": "performance",
            "maxSize": 20,
            "maxAge": "2h",
            "timeout": "5s"
        }
    }
]