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Progressive Web Application Development by Example

You're reading from   Progressive Web Application Development by Example Develop fast, reliable, and engaging user experiences for the web

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Product type Paperback
Published in Jul 2018
Publisher Packt
ISBN-13 9781787125421
Length 354 pages
Edition 1st Edition
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Author (1):
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Chris Love Chris Love
Author Profile Icon Chris Love
Chris Love
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Table of Contents (12) Chapters Close

Preface 1. Introduction to Progressive Web Apps FREE CHAPTER 2. Creating a Home Screen Experience with a Web Manifest 3. Making Your Website Secure 4. Service Workers – Notification, Synchronization, and Our Podcast App 5. The Service Worker Life Cycle 6. Mastering the Cache API - Managing Web Assets in a Podcast Application 7. Service Worker Caching Patterns 8. Applying Advanced Service Worker Cache Strategies 9. Optimizing for Performance 10. Service Worker Tools 11. Other Books You May Enjoy

Using the Fetch API

We have already seen the Fetch API being used in Chapter 4, Service Workers – Notification, Synchronization, and Our Podcast App, so let's do a quick review. Fetch is a modern replacement for XMLHttpRequest. It is asynchronous, relying on promises, and provides a more streamline interface to manage dynamic requests. You can customize requests by creating custom Request and header objects. Service workers rely on Fetch to make network requests.

The fetch() method takes two parameters, the URL that you are requesting (or a request object) and an options object. This method returns a promise object.

There are also some differences from how you may be accustomed to making AJAX requests. Fetch does not usually throw an exception on HTTPS status codes, only if there is a network problem making the request, which typically indicates a platform or...

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