HTTP post 请求错误连接被拒绝 Flutter

Question

我正在使用 flutter android 模拟器来运行我的应用程序。应用程序使用 HTTP 发布请求将 json 文件发送到 API。现在，我在向 API 发送请求时遇到了问题，因为它显示了连接问题。 API是用flask构建的。

这里是 HTTP POST 请求的代码：

Future<PredictionModel> predictionOutput(
    double aveHomeGoal,
    double aveAwayGoal,
    int homeWinPercentage,
    int awayWinPercentage,
    int homeDrawPercentage,
    int awayDrawPercentage,
    int homeRating,
    int awayRating,
    int homePost,
    int awayPost,
    int postDiff) async {
  var headers = {'Content-Type': 'application/json'};
  var request =
      http.Request('POST', Uri.parse('http://127.0.0.1:5000/predict'));
  request.body =
      '''{"inputs":[ aveHomeGoal, aveAwayGoal, homeWinPercentage, awayWinPercentage, homeDrawPercentage, awayDrawPercentage, homeRating, awayRating, homePost, awayPost, postDiff]}''';
  request.headers.addAll(headers);

  http.StreamedResponse response = await request.send();

  if (response.statusCode == 200) {
    print(await response.stream.bytesToString());
  } else {
    print(response.reasonPhrase);
  }

这是我点击 POST 请求时得到的错误：

E/flutter (17691)：[ERROR:flutter/lib/ui/ui_dart_state.cc(186)] 未处理的异常：SocketException：操作系统错误：连接被拒绝，errno = 111，地址 = 127.0.0.1，端口 = 59892

这是 Postman 的屏幕截图，显示 API 正在运行：