onRequest method

@override Future<void> onRequest(RequestOptions options, RequestInterceptorHandler handler)

Called when the request is about to be sent.

Implementation

@override
Future<void> onRequest(
  RequestOptions options,
  RequestInterceptorHandler handler,
) async {
  try {
    // 检查网络连接
    final connectivity = await Connectivity().checkConnectivity();

    if (connectivity == ConnectivityResult.none) {
      // 无网络连接，拒绝请求
      return handler.reject(
        DioException(
          requestOptions: options,
          type: DioExceptionType.connectionError,
          error: '网络异常，请检查网络连接',
        ),
      );
    } else {
      // 有网络连接，继续请求
      handler.next(options);
    }
  } catch (error) {
    // 检查网络时出错，继续请求（保守策略）
    handler.next(options);
  }
}