Sure -- when I build a system, I make sure I can always retry all the requests. Because there's never a guarantee that the client got the response, or stored the results successfully. It could make a follow up request, but lost power or been killed or whatever before the results were stored, and next time start over. Sometimes the server failed to store, but told the client it did -- that's fun too, but thankfully I control the servers and can usually limit the damage of that.

But, most people don't realizing the byzantine hell we all inhabit; and http(s) client library defaults for retrying apparently idempotent requests will often work well enough; but server idle configured less than client idle is much easier to trip over.