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At A-Level you must know not just the names of key application-layer protocols, but how they work, what messages they exchange, and when to use each one. This lesson covers the most important protocols in depth.
HTTP is the protocol used to request and deliver web pages and web resources (images, scripts, stylesheets). It operates on port 80 by default.
How it works (simplified):
Common HTTP Methods:
| Method | Purpose |
|---|---|
| GET | Retrieve a resource |
| POST | Submit data to the server (e.g. form submission) |
| PUT | Update/replace a resource |
| DELETE | Remove a resource |
Common HTTP Status Codes:
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