Table of Contents

1. HTTP Methods: Idempotent vs Non-Idempotent
2. OPTIONS Method
3. CORS (Cross-Origin Resource Sharing)
4. Simple Request Flow
5. Pre-flighted Request
6. HTTP Response Codes
7. Caching in HTTP
8. Content Negotiation
9. HTTP Compression
10. Persistent Connections and Keep-Alive
11. Handling Large Requests and Responses
12. SSL, HTTPS, and TLS

HTTP Methods: Idempotent vs Non-Idempotent {#http-methods}

Idempotent Methods

Definition: GET, PUT, DELETE

These HTTP methods can be called multiple times and we cannot expect the same kind of result.

Non-Idempotent Methods