Idempotent just means that following a link twice has exactly the same effect on persistent state as clicking it once. It does not mean that following the link must not change state, just that after following it once, following it again must not change state further. There are good reasons to avoid GET requests for changing state, but that’s not what idempotent means.
https://hyp.is/JTNJ6uaLEeuFtzvtkXWaeA/developer.mozilla.org/en-US/docs/Glossary/Safe/HTTP confirms this claim and states it even more clearly.







