Generate a fresh idempotency key for a mutating request.
Returns a UUID v4, which satisfies the spec's ^[A-Za-z0-9_.:-]{16,255}$ pattern and provides ≥122 bits of entropy (the spec minimum to prevent cache enumeration).
^[A-Za-z0-9_.:-]{16,255}$
Generate a fresh idempotency key for a mutating request.
Returns a UUID v4, which satisfies the spec's
^[A-Za-z0-9_.:-]{16,255}$pattern and provides ≥122 bits of entropy (the spec minimum to prevent cache enumeration).