Is this method side-effect-free (or safe in HTTP parlance), or idempotent, or neither? HTTP based RPC implementation may choose GET verb for safe methods, and PUT verb for idempotent methods instead of the default POST.

from enum google.protobuf.MethodOptions.IdempotencyLevel

Enumeration Members

IDEMPOTENCY_UNKNOWN: 0

from enum value: IDEMPOTENCY_UNKNOWN = 0;

IDEMPOTENT: 2

idempotent, but may have side effects

from enum value: IDEMPOTENT = 2;

NO_SIDE_EFFECTS: 1

implies idempotent

from enum value: NO_SIDE_EFFECTS = 1;