HTTP Basics

The Webb

A Web Request

1. Browser asks DNS for the IP address of server.com.

2. Browser connects to TCP port 80/443 of server.com.

3. Browser sends a request with:

   1. Action: GET, POST, PUT, DELETE

   2. URL: http://server.com

   3. Headers: language, compression, user-agent.

HTTP Structure

Multiple Web Requests

HTTP is stateless by design.

HTTP Requests are independent of each other.

• Each triggering and individual action.

• Usually tokens or cookies are included in requests/ responses to keep state.