# Haravan + OneSignal - How to configure 2 service workers

## Requirements:
We have to upload two file service workers in any subdirectory
Examples:
- https://maisononline.vn/apps/hrvsw/OneSignalSDKWorker.js?v=1594811926126
- https://maisononline.vn/apps/hrvsw/OneSignalSDKUpdaterWorker.js?v=1593143499086

We need to ensure there is the HTTP header: "Service-Worker-Allowed : /" when you get the files
You can check the Header like below using Chrome Network Tool

## Setup in OneSignal Dashboard

We **must** choose <b>Typical setup</b>


Go to Advanced section

1) Path service worker files
This is the directory of the service workers

2) Main service worker filename
This is the name of the service file
Value: ```OneSignalSDKWorker.js?v=1594811926126```
3) Updater service worker filename
This is the name of the service updater file
Value: ```OneSignalSDKUpdaterWorker.js?v=1593143499086```

4) Service worker registration scope
This is the most important thing!, decide where we can register our service worer
Value: ```/```
Root mean at we can always register the sw at all pages
However, this requires Haravan to setup the HTTP header ```"Service-Worker-Allowed : /"``` when in the response when we get the files before.

Below is the sample code of Maison

<script src="https://cdn.onesignal.com/sdks/OneSignalSDK.js" async=""></script>
<script>
  window.OneSignal = window.OneSignal || [];
    var initConfig = {
        appId: "8b9d04ed-04cf-41a0-a3ab-81c8e16e896b",
        notifyButton: {
            enable: true
        },
      path: '/apps/hrvsw/'
    };
    
    OneSignal.push(function () {     
        // This registers the workers at the root scope, which is allowed by the HTTP header "Service-Worker-Allowed: /"
        OneSignal.SERVICE_WORKER_PARAM = { scope: '/' };
        OneSignal.SERVICE_WORKER_PATH = 'apps/hrvsw/OneSignalSDKWorker.js?v=1594811926126'
        OneSignal.SERVICE_WORKER_UPDATER_PATH = 'apps/hrvsw/OneSignalSDKUpdaterWorker.js?v=1593143499086'
        OneSignal.init(initConfig);
    });
</script>

References:

https://documentation.onesignal.com/docs/onesignal-service-worker-faq

https://documentation.onesignal.com/docs/web-push-custom-code-examples#section-initialization

Additional Steps: Delete users if reach more than 100 users
https://documentation.onesignal.com/docs/delete-users