The section has to do with automatic retry of non-idempotent requests, a successful PING roundtrip does not *guarantee* that any failed non-idempotent requests can be retried safely... and it certainly does not guarantee that any subsequent non-idempotent requests will be successfully received and processed. It might make sense to add text somewhere else that recommends testing a connection before attempting to send a large amount of data, but that has nothing to do with non-idempotent retry.