What is the difference between the GET and POST methods in HTTP?

• GET: Requests to retrieve data. Parameters are passed in the URL. Idempotent, cacheable, limited in data volume. Used for safe operations.
• POST: Requests to send data for creating or updating a resource. Parameters are passed in the request body. Not idempotent, not cached by default, no strict data volume restrictions. Used for operations with undesirable side effects.

Example GET:

GET /users?id=123 HTTP/1.1
Host: example.com

Example POST:

POST /users HTTP/1.1
Host: example.com
Content-Type: application/json
Content-Length: 27

{"name": "John Doe"}

Key differences in the table:

Attribute	GET	POST
Purpose	Data retrieval	Sending/updating data
Data transfer	In URL	In request body
Idempotency	Yes	No
Caching	Yes	No (by default)
Security	Parameters visible in URL	Parameters hidden in request body
Data size limit	Exists (depends on browser/server)	No
Usage	Retrieving information	Sending forms, uploading files