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Official Description & Notes

IGCSE Computer Science 0478 HTTP, HTTPS Protocols & Web Browser Features | Chapter 5 Internet & Its Uses

Complete lecture on Internet Protocols and Web Browsers from Chapter 5 for IGCSE Computer Science 0478 Paper 1 — covering HTTP and HTTPS protocols, web page retrieval process, SSL and TLS, digital certificates and all web browser features with exam-style questions.

Topics covered:
- Protocol definition — a set of rules that help computers communicate correctly over a network
- Protocols check for errors in data transmission and ensure information arrives safely
- Two protocols required for IGCSE — HTTP and HTTPS
- HTTP — Hypertext Transfer Protocol, transfers web pages images and content between server and browser
- HTTP does not encrypt data — hackers can see passwords and personal information sent over HTTP
- HTTP web page retrieval process — user enters URL, DNS resolves domain to IP address, browser requests page, server sends HTML CSS and scripts, browser renders and displays page
- Browser uses HTTP not FTP to request web pages — common exam mistake
- HTTPS — Hypertext Transfer Protocol Secure, adds encryption to protect data during transfer
- Certificate Authority — verifies website authenticity and issues digital certificate
- HTTPS web page retrieval process — browser requests digital certificate first, server sends certificate, browser verifies authenticity, encrypted communication begins
- If certificate is not authentic — browser flags website as insecure
- HTTPS uses SSL or TLS for encrypted communication
- Two ways to identify a secure website — HTTPS prefix in URL and padlock icon before the URL
- Clicking padlock icon verifies the website's digital certificate
- Comparing HTTP and HTTPS — plain text vs encrypted, not secure vs trusted by browsers
- Web browser definition — application software that allows users to access information on the World Wide Web
- Difference between web browser and search engine — Google Chrome is a browser, Google is a search engine
- Web browsers request HTML files from web server, render and display content to user
- Web browsers do not create or host websites — common misconception
- Eight key features of web browser — address bar, user history, bookmarks and favourites, multi-tab functionality, navigation buttons, cookies management, password storage and HTML rendering
- Multi-tab functionality opens multiple pages in one window not different windows — common exam mistake
- Favourites feature saves web pages for quicker future access

Chapters:
0:03 What is a Protocol
0:38 HTTP — Hypertext Transfer Protocol
1:35 HTTP Web Page Retrieval Process
2:59 HTTP Retrieval Process Illustrated
3:50 HTTPS — Hypertext Transfer Protocol Secure
4:49 HTTPS Web Page Retrieval Process
5:12 HTTPS Retrieval Process Illustrated
6:19 Features of HTTPS — SSL TLS Digital Certificate
6:57 How to Identify a Secure Website
8:25 HTTP vs HTTPS Comparison
9:16 Web Browser Definition and Purpose
9:45 Web Browser vs Search Engine
10:15 Key Features of a Web Browser

IGCSE Computer Science 0478 | CIE Cambridge Computer Science | HTTP HTTPS IGCSE |
Web browser features IGCSE | Digital certificate SSL TLS | Chapter 5 internet uses | Paper 1 2026 | IGCSE CS revision 2026