onError method
Called when the interceptor should process an error
Return a future with (modified) DioException
to continue the chain
or an instance of Response
(or subclasses) to halt processing and
mark the request as successful. NOTE: When returning Response
, no other
interceptors will be called.
Any other values will simply call the next interceptor with error
Implementation
Future<Object?> onError(DioException error) {
return Future.value(error);
}