Is PUT/DELETE idempotent with REST automatic?

Question

I am learning about REST and PUT/DELETE, I have read that both of those (along with GET) is idempotent meaning that multiple requests put the server into the same state.

Answer 1

PUT operation are idempotent but not safe operation. On success if PUT operation is repeated it will not insert duplicate records. Repeat PUT operation in case of NetworkFailure errors after verifying conditional headers like If-unmodified-since and/or if-match. Don't repeat in case of 4XX or 5XX error codes.