Why use HTTP methods when performing operations?

HTTP methods define the desired action of the server on the resource specified in the URI. Using the correct method ensures:

• Semantic clarity: Allows understanding the purpose of the request (retrieval, creation, update, deletion).
• Caching: Some methods (e.g., GET) can be cached, which improves performance.
• Security: Separating operations by methods allows applying appropriate security measures (e.g., requiring authentication for POST, PUT, DELETE).
• Idempotency: Some methods (e.g., GET, PUT, DELETE) are idempotent, meaning multiple executions lead to the same result as a single execution. POST is not idempotent.
• Standardization: Follows the generally accepted standard of interaction between client and server, simplifying development and integration.

Main methods:

Method	Purpose	Idempotent?	Cacheable?
GET	Retrieve resource data	Yes	Yes
POST	Create a new resource or send data	No	No
PUT	Update an existing resource	Yes	No
DELETE	Delete a resource	Yes	No
PATCH	Partial update of a resource	No	No
HEAD	Retrieve only response headers GET	Yes	Yes
OPTIONS	Get supported methods for the resource	Yes	No