The Web

• The Web; hyperlinks; history of the Web
• Client-server model
• HTTP/1, TLS
• HTML/CSS basics
• HTTP/2

The Web

• The Web is a collection of interconnected documents and other resources
• ■ It is an application that runs on top of the Internet
• ■ The Web is based on some of the ideas that go back all the way to the 1940s
• ■ Many “ingredients” are needed to make something like the Web work – protocols, formats, naming schemes, …

The client-server model

HTTP

HTML

HTTP/2 and HTTP/3