PreconditionFailure

Describes what preconditions have failed.

For example, if an RPC failed because it required the Terms of Service to be acknowledged, it could list the terms of service violation in the PreconditionFailure message.

JSON representation 
{
  "violations": [
    {
      object(Violation)
    }
  ]
}
Fields
violations[]

object(Violation)

Describes all precondition violations.

Violation

A message type used to describe a single precondition failure.

JSON representation 
{
  "type": string,
  "subject": string,
  "description": string
}
Fields
type

string

The type of PreconditionFailure. We recommend using a service-specific enum type to define the supported precondition violation subjects. For example, "TOS" for "Terms of Service violation".
subject

string

The subject, relative to the type, that failed. For example, "google.com/cloud" relative to the "TOS" type would indicate which terms of service is being referenced.
description

string

A description of how the precondition failed. Developers can use this description to understand how to fix the failure.

For example: "Terms of service not accepted".