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Pouyam Pouyam
S'inscrire Connexion
Académie
Débutant Quartier du code

Comment fonctionne le web

Navigateurs, serveurs, HTTP, DNS et API, expliqués simplement.

Every time you open a page, scroll your feed or send a message, dozens of machines work together in a fraction of a second. This track shows you how: clients and servers, IP addresses and ports, DNS, URLs and HTTP, how browsers build pages from HTML, CSS and JavaScript, APIs and JSON, HTTPS, cookies and tokens, caching and CDNs, speed on slow networks, and the security rules that keep everyone safe.

You finish by following one tap in a small social app called Nova from your phone to the database and back. Nothing to install: just curiosity and a browser.

Leçons
19
Durée
2 h
Niveau
Débutant
Commencer le parcours · Clients and servers

Les leçons de ce parcours sont en anglais pour le moment.

  • Bronze disponible
  • Argent disponible
  • Or verrouillé

Envie de faire vos preuves ?

Trois examens vous attendent : Bronze, Argent et Or.

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Ce que vous saurez faire

  • Explain, step by step, what happens between typing an address and seeing the page
  • Read and write HTTP requests and responses, and call an API with curl and fetch
  • Debug a page with your browser's developer tools
  • Understand HTTPS, cookies, sessions and tokens well enough to keep users safe
  • Make pages faster on slow networks with caching, CDNs and smaller downloads
  • Describe how a typical web platform is built, from browser to database

L'itinéraire

  1. 1
    Module 1

    Clients, servers and addresses

    Who asks and who answers, how machines find each other with IP addresses and ports, and how DNS turns names into addresses.

    0 / 4
    2. IP addresses and ports Leçon · 7 min · +20 XP
    3. DNS: from names to addresses Leçon · 7 min · +20 XP
    4. Practice: the journey of a visit Entraînement · 6 min · +25 XP
  2. 2
    Module 2

    Speaking HTTP

    URLs, requests, methods, status codes and headers: the language browsers and servers share.

    0 / 4
    1. Anatomy of a URL Leçon · 6 min · +20 XP
    2. Requests and methods Leçon · 7 min · +20 XP
    3. Status codes and headers Leçon · 7 min · +25 XP
    4. Boss: speak HTTP Combat de boss · 8 min · +40 XP
  3. 3
    Module 3

    Browsers and APIs

    How a browser turns HTML, CSS and JavaScript into a page, and how pages fetch JSON from APIs.

    0 / 3
    1. From bytes to pixels Leçon · 7 min · +20 XP
    2. APIs and JSON Leçon · 7 min · +25 XP
    3. Practice: open the hood Entraînement · 6 min · +25 XP
  4. 4
    Module 4

    Security and signing in

    HTTPS and certificates, cookies, sessions and tokens, the same-origin policy, CORS and why the server never trusts the client.

    0 / 4
    1. HTTPS and TLS Leçon · 7 min · +20 XP
    2. Cookies, sessions and tokens Leçon · 8 min · +25 XP
    3. Origins, CORS and trust Leçon · 8 min · +25 XP
    4. Boss: lock it down Combat de boss · 8 min · +45 XP
  5. 5
    Module 5

    Speed and the big picture

    Caching and CDNs, speed on slow networks, and how a whole web app fits together.

    0 / 4
    1. Caching and CDNs Leçon · 7 min · +25 XP
    2. Fast on slow networks Leçon · 7 min · +20 XP
    3. How a web app is built Leçon · 8 min · +25 XP
    4. Final boss: the whole web Combat de boss · 10 min · +50 XP

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