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by dragonwriter 3187 days ago
> > safe operations are a subset of idempotent operations

> Definitely not. 'Safe' means too many things in different contexts to make sweeping statements like that.

The intended reference (which I hoped would be recognized generally in this audience) was to he definition of “safe” and “idempotent” in HTTP (see section 4.2 of RFC 7231.)

(In your example, neither operation is “safe” in the HTTP sense; all state-modifying operations are unsafe.)