Which request is idempotent?

An idempotent request is an HTTP request that can be performed multiple times in a row without changing the server's state after the first execution.

Examples of idempotent methods:

• GET — simply retrieves data without modifying it.
• PUT — updates a resource; repeated calls will have the same effect.
• DELETE — deletes a resource; repeated deletion of the same resource will not change the state.

For example, sending a PUT request to update a user's profile with the same data multiple times will leave the user's state unchanged.

Unlike POST, which is usually not idempotent, as each call can create a new resource or change the state.