1
00:00:02,640 --> 00:00:09,230
In this course module, you've got an overview over the API and the promise API, two super important API

2
00:00:09,240 --> 00:00:15,840
you have to know when working with service workers and with progressive web apps in general. You will

3
00:00:15,840 --> 00:00:20,600
notice that throughout this course, we use promises all over the place,

4
00:00:20,610 --> 00:00:26,940
therefore this then call and catch call has to be something you immediately recognize and you understand

5
00:00:26,940 --> 00:00:29,030
where it's coming from and what it does,

6
00:00:29,040 --> 00:00:31,200
that was the goal of this module.

7
00:00:31,200 --> 00:00:34,490
You'll also see that we do quite a lot of fetch requests,

8
00:00:34,500 --> 00:00:36,790
we'll even use fetch in the service worker,

9
00:00:36,810 --> 00:00:38,950
actually we already do so as you learned

10
00:00:39,120 --> 00:00:43,100
and it's important to understand for you too, what does fetch actually do?

11
00:00:43,140 --> 00:00:44,610
It sends a HTTP request,

12
00:00:44,670 --> 00:00:46,270
that's the core of it.

13
00:00:46,320 --> 00:00:52,800
Now if that you're well prepared and we can now go back to the progressive web app and dive much deeper

14
00:00:52,890 --> 00:00:54,060
into service workers.