![]() For example, a change in your app's logic, an image that is part of your interface, or a CSS stylesheet. Updating assets includes any changes to files you use to render the app's interface, such as HTML, CSS, JavaScript, and images. ![]() The Web Push API is the only API to notify the user from the background and its push message can include a small amount of data: it can carry a payload of up to around 2KB. When you use one of these APIs, you can run code in the service worker thread for example, to download data from your server and update your IndexedDB data. They are currently available only on Chromium-based browsers, on Android, and desktop operating systems. This API requires the user's permission.Īll these APIs are executed from the service worker context. This is commonly called a 'push notification'. Web push: sends a message from the server that wakes up the service worker and notifies the user.Background Fetch: downloads large files, even when the PWA is closed.Web periodic background sync: syncs data periodically in the background, at specific times, allowing the app to provide updated data even if the user hasn't opened the app yet.Background synchronization: saves requests that failed and retries them using sync from the service worker.On compatible browsers, there are options to sync data, not only when the user opens the PWA but also in the background. If your app supports any offline features, remember to keep the data that supports the features updated too. To update data, such as that stored in IndexedDB, you can use tools such as Fetch, WebRTC, or WebSockets API. Let's check out the best practices for each of these elements. ![]() The service worker file, or its dependencies.When you update the app, it's important to apply best practices to avoid pitfalls. ![]() You have published your PWA: some users use it from the browser, others install it on their devices. ![]()
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