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Academia
Principiante Distrito del código

Cómo funciona la web

Navegadores, servidores, HTTP, DNS y APIs, explicados.

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.

Lecciones
19
Tiempo
2 h
Nivel
Principiante
Empezar el curso · Clients and servers

Por ahora, las lecciones de este curso están en inglés.

  • Bronce disponible
  • Plata disponible
  • Oro bloqueado

Es hora de demostrarlo

Te esperan tres exámenes: Bronce, Plata y Oro.

Ir a los exámenes

Lo que podrás hacer

  • 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

El recorrido

  1. 1
    Módulo 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 Lección · 7 min · +20 XP
    3. DNS: from names to addresses Lección · 7 min · +20 XP
    4. Practice: the journey of a visit Práctica · 6 min · +25 XP
  2. 2
    Módulo 2

    Speaking HTTP

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

    0 / 4
    1. Anatomy of a URL Lección · 6 min · +20 XP
    2. Requests and methods Lección · 7 min · +20 XP
    3. Status codes and headers Lección · 7 min · +25 XP
    4. Boss: speak HTTP Jefe final · 8 min · +40 XP
  3. 3
    Módulo 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 Lección · 7 min · +20 XP
    2. APIs and JSON Lección · 7 min · +25 XP
    3. Practice: open the hood Práctica · 6 min · +25 XP
  4. 4
    Módulo 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 Lección · 7 min · +20 XP
    2. Cookies, sessions and tokens Lección · 8 min · +25 XP
    3. Origins, CORS and trust Lección · 8 min · +25 XP
    4. Boss: lock it down Jefe final · 8 min · +45 XP
  5. 5
    Módulo 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 Lección · 7 min · +25 XP
    2. Fast on slow networks Lección · 7 min · +20 XP
    3. How a web app is built Lección · 8 min · +25 XP
    4. Final boss: the whole web Jefe final · 10 min · +50 XP

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