onError method
Called when an exception was occurred during the request.
Implementation
@override
void onError(DioException err, ErrorInterceptorHandler handler) {
if (!enabled) return handler.next(err);
final js = genByJson(err.response?.data);
logPrint([
"ERR ${err.runtimeType}: ${err.requestOptions.uri.path} <<<<<<<<<<<<<",
"ERR-RSP $js",
if (errExtra != null) "ERR-EXT ${errExtra?.call(err)}",
].join('\n'));
return handler.next(err);
}