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.

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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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