etag
Parameters
value
etag
is used for optimistic concurrency control as a way to help prevent simultaneous updates of a model from overwriting each other. It is strongly suggested that systems make use of the etag
in the read-modify-write cycle to perform model updates in order to avoid race conditions: An etag
is returned in the response to GetVersion
, and systems are expected to put that etag in the request to UpdateVersion
to ensure that their change will be applied to the model as intended.