onError method
Called when an exception was occurred during the request.
Implementation
@override
void onError(DioException err, ErrorInterceptorHandler handler) {
// Create an empty response with the [RequestOptions] for delivery.
var response = Response<dynamic>(requestOptions: err.requestOptions);
response.requestOptions.endTimeMilliseconds = _timestamp;
logBoxE(getResponseLog(response));
logBoxE(err);
handler.next(err);
}