#HTTP & HTTPS

The foundation of web communication.

#HTTP Methods

Method	Purpose	Idempotent
GET	Retrieve data	Yes
POST	Create resource	No
PUT	Update/replace	Yes
PATCH	Partial update	No
DELETE	Remove resource	Yes
HEAD	Headers only	Yes
OPTIONS	Get methods	Yes

#Status Codes

Range	Category	Examples
1xx	Informational	100 Continue
2xx	Success	200 OK, 201 Created
3xx	Redirect	301 Moved, 302 Found
4xx	Client Error	400 Bad Request, 404 Not Found
5xx	Server Error	500 Internal, 503 Unavailable

#HTTPS

HTTPS = HTTP + TLS encryption

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#Testing with cURL

bash

1# GET request
2curl https://api.example.com/users
3
4# POST with JSON
5curl -X POST -H "Content-Type: application/json" \
6  -d '{"name":"John"}' https://api.example.com/users
7
8# With headers
9curl -H "Authorization: Bearer token" https://api.example.com
10
11# Show response headers
12curl -I https://example.com
13
14# Verbose mode
15curl -v https://example.com