You mentioned idempotency — can you explain what you meant?

Idempotency is a property of an operation where multiple executions with the same input produce the same result as a single execution.

In the context of web development, this is important for HTTP requests: for example, if a delete request (DELETE) is idempotent, then repeated calls to this request will not change the server state after the first successful deletion.

Example:

• The first DELETE /items/123 request will delete the item with id 123.
• The second and subsequent DELETE /items/123 requests will not change the state (the item is already deleted), but will not cause an error.

This property helps safely repeat requests in case of network failures or errors, without fear of unintended side effects.