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COURSE · 1 chapter · 3 lessons

How web apps work

Read what actually travels between the browser and the server

Reading the networking chapter first (HTTP, addresses, the round trip) makes this course click sooner. You can still get through it without. See the How computers work course

You do not write code in this course — every question is multiple choice. One chapter and three lessons are ready, and reading them in order works best.

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Two kinds of round trip

  1. 01Two kinds of round tripOne round trip fetches the container for the screen, the other fetches the data inside it. This lesson gets you seeing them separately.10 slides · 13 exercisesGo to the exercises

Where the HTML gets built

  1. 02Where the HTML gets builtThe same screen can have its HTML built in three different places. You pick by which you want: a fast first paint, fresh data, or a light server.11 slides · 13 exercisesGo to the exercises

The round trip that fetches data

  1. 03The round trip that fetches dataWhat you send, what happens in order inside the server, and how to read the number that comes back. One round trip, taken apart.12 slides · 13 exercisesGo to the exercises