Gain insights into Progressive Web Apps. Delve into service workers, caching strategies, and their advantages. Learn about real-world Angular projects and deploying PWAs using Firebase. Optimize your web solutions efficiently.

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Progressive Web Applications are the state of modern web solutions. With the proper strategies, it is possible to drastically improve the overall performance and providing data even without a network connection. 
In an increasingly mobile-first world, optimising the time to load web pages can be our business's success. 

We will start by describing what PWAs are and their advantages over native and plain web applications. We then go deeper analysing fundamental concepts like service workers, caching strategies and when to use them in different scenarios. 

Aside from generic, framework-agnostic code samples, there will be an entire "hands-on" section dedicated to Angular, where we will create a complete, real-world PWA project from scratch.

Finally, we will learn how to deploy our PWAs to the cloud with different providers, describing in detail the approach with the Firebase platform. Thus, concluding our journey in the PWAs world.

Optimize your web projects with Progressive Web Apps

Caching strategies can be used to provide data offline.

Caching strategies can be used to provide data offline.

The “network falling back to cache” strategy immediately accesses the cache if no network connection is available.

The “network falling back to cache” strategy immediately accesses the cache if no network connection is available.

Which caching strategy does the code below implement?

self.addEventListener('fetch', function(event) {

	event.respondWith(async () => {
		const cache = await caches.open('cache-v1');
		const cachedResponse = await cache.match(event.request);
		const fetchPromise = fetch(event.request);
		
		event.waitUntil(async () => {
			const networkResponse = await fetchPromise;
			await cache.put(request, networkResponse.clone());
		}());
		
		return cachedResponse || networkResponse;
	}());
});

Which caching strategy does the code below implement?
self.addEventListener(‘fetch’, function(event) {
<pre><code>event.respondWith(async () =&gt; {
	const cache = await caches.open('cache-v1');
	const cachedResponse = await cache.match(event.request);
	const fetchPromise = fetch(event.request);
	
	event.waitUntil(async () =&gt; {
		const networkResponse = await fetchPromise;
		await cache.put(request, networkResponse.clone());
	}());
	
	return cachedResponse || networkResponse;
}());
</code></pre>
});

The cache interface stores the response data on the local device.

The cache interface stores the response data on the local device.

We can NOT cache a POST request using the Cache API.

We can NOT cache a POST request using the Cache API.

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I hope this quiz was a helpful review. In the next chapter, you will explore some tools used to test and validate our progressive web applications.

Test what you have learned so far about caching strategies.

Introduction

The Progressive Approach

Install a PWA on a Device

Service Workers

Caching Strategies

PWA Tools and Libraries

Angular PWA

Deploying our PWA

Wrap up

Test