The list of errors thrown by the server.

ERROR_UNSPECIFIED Error code unspecified.
INVALID_REQUEST The request is missing a parameter, contains an invalid parameter, includes a parameter more than once, or is otherwise invalid.
ACCESS_DENIED The user or authorization server denied the request
UNAUTHORIZED_CLIENT The client is not allowed to request an authorization code using this method.
UNSUPPORTED_RESPONSE_TYPE The server does not support obtaining an authorization code using this method.
INVALID_SCOPE The requested scope is invalid or unknown.
SERVER_ERROR Instead of displaying a 500 Internal Server Error page to the user, the server can redirect with this error code.
TEMPORARILY_UNAVAILABLE If the server is undergoing maintenance, or is otherwise unavailable, this error code can be returned instead of responding with a 503 Service Unavailable status code.