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No, of the "base" HTTP/1.1 methods, all safe methods (GET, HEAD, OPTIONS, TRACE) and some unsafe methods (PUT and DELETE) are idempotent.
POST is neither safe nor idempotent (and safety is the key feature here, rather than idempotence.)
GET, HEAD, and POST are cacheable methods, which you may be confusing with idempotent methods. These are very different categories, however.
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No, of the "base" HTTP/1.1 methods, all safe methods (GET, HEAD, OPTIONS, TRACE) and some unsafe methods (PUT and DELETE) are idempotent.
POST is neither safe nor idempotent (and safety is the key feature here, rather than idempotence.)
GET, HEAD, and POST are cacheable methods, which you may be confusing with idempotent methods. These are very different categories, however.