Einsteiger Code-Viertel

So funktioniert das Web

Browser, Server, HTTP, DNS und APIs einfach erklärt.

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.

Lektionen: 19
Zeit: 2 Std.
Level: Einsteiger

Kurs starten · Clients and servers

Die Lektionen dieses Kurses gibt es vorerst nur auf Englisch.

Bronze offen
Silber offen
Gold gesperrt

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Drei Prüfungen warten auf dich: Bronze, Silber und Gold.

Zu den Prüfungen

Das wirst du können

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

Die Reise

1
Modul 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.

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2
Modul 2
Speaking HTTP

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

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3
Modul 3
Browsers and APIs

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

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4
Modul 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.

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5
Modul 5
Speed and the big picture

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

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