How long does a service worker keeps its cache?

Question

I just got into Service Workers and made a simple setup for my site.

The documentation is quite good, but I wasn't able to find anywhere how much a service workers keeps the caches? I'm doing cache busting for my js and css assets (something like bundle.[hash].js) and I'm not sure if I should make sure to clean up the old assets from the cache manually or will they just expire in some time?

Answer 1

Did you check the documentation?

http://www.html5rocks.com/en/tutorials/service-worker/introduction/#toc-how

When we're installed, the activation step will follow and this is a great opportunity for handling any management of old caches, which we'll cover during the service worker update section.

The page I linked to explains "How to Cache and Return Requests"

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

  var cacheWhitelist = ['pages-cache-v1', 'blog-posts-cache-v1'];

  event.waitUntil(
    caches.keys().then(function(cacheNames) {
      return Promise.all(
        cacheNames.map(function(cacheName) {
          if (cacheWhitelist.indexOf(cacheName) === -1) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});

Answer 2

You can set the cache age by controlling cache-controller :

public
Expires: (sometime in the future, according session.cache_expire) Cache-Control: public, max-age=(sometime in the future, according to session.cache_expire) Last-Modified: (the timestamp of when the session was last saved)

and also,

<?php header( 'Cache-Control: max-age=604800' ); /* now get and send images */ ?>

see Here : enter link description here