postRequest() async {
    Map\<String, dynamic\> map = {
        'email': '[email protected]',
        'password': '1234',
    };

    try {
        var url = Uri.parse('http://127.0.0.1:8000/api/login');
        var response = await http.post(url,
            headers: {
                'Accept': 'application/json'
            },
            body: jsonEncode(map)
        );

        if (response.statusCode == 200) {
            var responseBody = jsonDecode(response.body);
            print(responseBody);
            return responseBody;
        } else {
            print("try error ${response.statusCode}");
        }
    } catch (e) {
        print("Error catch ${e}");
    }
}

错误：

I/flutter (25242): 错误捕获连接被拒绝