What is an HTTP request and response in web development?

HTTP is a request/response protocol. The client sends method + URL + headers (+ optional body), and the server returns a status code, headers, and body. Clear understanding of GET/POST/PUT/DELETE, idempotency, and caching headers helps you debug network issues and build predictable UI data flows.

const response = await fetch('/api/profile', {
  method: 'PATCH',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ displayName: 'Alex' }),
});
if (!response.ok) throw new Error('Request failed');

Start simple: try this concept in a tiny project before moving to advanced tools.