Describe the purpose and operation of HTTP and HTTPS

The Internet and Its Uses

HTTP – The Language of the Web

Imagine you want to ask a friend for a book. You write a letter (the request) and drop it in the mailbox. Your friend receives it, reads it, and writes back a reply (the response). HTTP works the same way on the web.

• Client (your browser) sends a request to a server.
• The server processes the request and sends back a response containing the requested data (e.g., a webpage).
• Both the request and response are made of text headers and body content (HTML, images, etc.).
• HTTP is stateless – each request is independent; the server doesn’t remember past requests unless you add extra mechanisms.

HTTPS – Secure HTTP

Now, suppose you want to send that same letter but you don’t want anyone else to read it. You put it in a sealed envelope and lock it with a key. HTTPS does exactly that: it encrypts the data so only the intended recipient can read it.

1. The client and server perform a handshake to agree on a shared secret key.
2. All data sent over the connection is encrypted using that key.
3. Even if someone intercepts the traffic, they only see scrambled information.