What is the difference between GET and POST methods?

The HTTP methods GET and POST differ in purpose and behavior:

• GET is used to retrieve data from the server. GET requests should not change the server's state and are considered idempotent.
• POST is used to send data to the server, for example, to create or modify resources. POST requests can change the server's state and are not idempotent.

Key differences:

• Data transfer: GET passes parameters in the URL (query string), POST in the request body.
• Security: GET requests are visible in the URL, can be cached and stored in browser history; POST is not.
• Size limitations: GET is limited by URL length, POST can transmit larger amounts of data.

Example:

GET request:

GET /users?id=123 HTTP/1.1

POST request:

POST /users HTTP/1.1
Content-Type: application/json

{"name": "Ivan", "age": 30}