Idempotent method is the one that results in same behavior either in a single or mutiple calls. For example a delete method will delete a resource
and return 204 first time. on subsequent calls it will return 404. return codes has nothting to do with idempotent behavior but the fact is that
behavior of call will always be the same.
+———+——+————+
| Method | Safe | Idempotent |
+———+——+————+
| CONNECT | no | no |
| DELETE | no | yes |
| GET | yes | yes |
| HEAD | yes | yes |
| OPTIONS | yes | yes |
| POST | no | no |
| PUT | no | yes |
| TRACE | yes | yes |
+———+——+————+
Reference
https://stackoverflow.com/questions/630453/what-is-the-difference-between-post-and-put-in-http
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