Error Codes and Types

Error Code	Meaning
400	Indicates that the server cannot process the request due to a malformed request.
401	Indicates that the request has not been completed due to its lack of valid authentication credentials for the requested resource.
403	Indicates that the server understands the request but the provided credentials do not have sufficient authorizations on the given resource.
404	Indicates that the requested resource does not exist.
409	Indicates a request conflict with the current state of the target resource. This can happen when trying to create a resource that already exists.
500	Indicates that the server encountered an unexpected condition that prevented it from fulfilling the request.
501	Indicates that the server does not support the functionality required to fulfill the request.

Error Type	Meaning
ALREADY_EXISTS	The resource with the provided ID already exists in the system.
FAILED_PRECONDITION	The operation was rejected because the system is not in a state required for the operation's execution.
INTERNAL	Internal error.
INVALID_ARGUMENT	The caller specified an invalid argument. Note that this differs from FAILED_PRECONDITION. INVALID_ARGUMENT indicates arguments that are problematic regardless of the state of the system (e.g., a malformed file name).
NOT_FOUND	The given ID does not correlate to an existing resource in the system.
OUT_OF_RANGE	The operation was attempted past the valid range.
UNIMPLEMENTED	The operation is not implemented or is not supported/configured in this service.
PERMISSION_DENIED	The caller does not have permission to execute the specified operation.
UNAUTHENTICATED	The request does not have valid authentication credentials for the operation.