Computer Science › Section E · Networking and the internet › Topic E.3

The World Wide Web

The web is the part of the internet most people see: pages linked to other pages, fetched by a browser in a fraction of a second. Behind every page sit three simple ideas, an address called a URL, a request protocol called HTTP and a markup language called HTML.

In this topic

  • The web is not the internet
  • Browsers, webservers and HTTP
  • URLs
  • Worked example: reading a URL
  • HTTP requests and responses
  • HTML: marking up a page
  • Links and images
  • Worked example: what a browser fetches
  • Client-side and server-side activity
  • XML and markup by meaning
  • Common mistakes to avoid
  • Key takeaways

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