WARNING identifying-info optional text
This response is returned to indicate a warning condition which does not affect the correctness of the response. This message can be used to indicate that the client is using an old version of the protocol that, while supported, should be phased out. It can also be used to inform the client of future changes on the server or scheduled downtime. The defined values for identifying-info appear below. optional text is optional text that provides additional information about the warning.
Any identifying-info that can follow a FAILURE message
Prospero clients are strongly encouraged to present warnings to the user.