pub const FAILED_PRECONDITION: Code;Expand description
The operation was rejected because the system is not in a state required for the operation’s execution. For example, the directory to be deleted is non-empty, an rmdir operation is applied to a non-directory, etc.
Service implementors can use the following guidelines to decide
between FAILED_PRECONDITION, ABORTED, and UNAVAILABLE:
(a) Use UNAVAILABLE if the client can retry just the failing call.
(b) Use ABORTED if the client should retry at a higher level. For
example, when a client-specified test-and-set fails, indicating the
client should restart a read-modify-write sequence.
(c) Use FAILED_PRECONDITION if the client should not retry until
the system state has been explicitly fixed. For example, if an “rmdir”
fails because the directory is non-empty, FAILED_PRECONDITION
should be returned since the client should not retry unless
the files are deleted from the directory.
HTTP Mapping: 400 Bad Request