onRequest method
请求发送前调用(可修改 RequestOptions)
Implementation
@override
Future<void> onRequest(RequestContext ctx, RequestOptions options) async {
// 将动态 evaluator 存入 extra,供 SmartRetryInterceptor 读取
final evaluator = _buildRetryEvaluator();
if (evaluator != null) {
options.extra[kRetryEvaluatorKey] = evaluator;
}
}