rest - 为什么flutter拒绝在本地主机上连接:8000 or 127. 0.01 :8000?

Question

我正在遵循Flutter Networking/HTTP教程对运行在localhost:8000上的服务器进行GET请求。通过我的浏览器访问我的本地主机工作正常。当我指向诸如https://example.com之类的任何真实URL时，此方法也能正常工作，但是当我指向https://127.0.0.1:8000时，会出现类似“连接被拒绝”之类的错误消息

每次我重新加载应用程序时，上述错误中的端口都会更改。我查看了http程序包代码，似乎没有一种方法可以指定URL的端口。我如何指向我的本地主机，这是我第一次 flutter ？
PS:我在我的电话设备上运行，我的PC和电话连接到相同的wifi，我的网络是专用的。

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:http/http.dart' as http;
import 'dart:convert';

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  static const url = 'http://127.0.0.1:8000/api/membres/';

  // static const url = 'http://10.0.2.2:8000/api/membres/';
  //static const url = 'http://localhost:8000/api/membres/';
  //static const url= "192.168.1...:8000/association/api/membres";
  //static const url = 'https://jsonplaceholder.typicode.com/users';
  Future<List<Map<String, dynamic>>> _future;

  @override
  void initState() {
    super.initState();
    _future = fetch();
  }

  Future<List<Map<String, dynamic>>> fetch() {
    return http
        .get(url)
        .then((response) {
          return response.statusCode == 200
              ? response.body
              : throw 'Error when getting data';
        })
        .then((body) => json.decode(body))
        .then((list) => (list as List).cast<Map<String, dynamic>>());
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: RefreshIndicator(
        onRefresh: () async {
          _future = fetch();
          setState(() {});
          return _future;
          },
        child: FutureBuilder<List<Map<String, dynamic>>>(
          future: _future,
          builder: (context, snapshot) {
            if (snapshot.hasError) {
              return Center(
                child: Container(
                  constraints: BoxConstraints.expand(),
                  child: SingleChildScrollView(
                    physics: AlwaysScrollableScrollPhysics(),
                    child: Text(snapshot.error.toString()),),),);}
            if (!snapshot.hasData) {
              return Center(
                child: CircularProgressIndicator(),
              );}
            return ListView.builder(
              itemCount: snapshot.data.length,
              itemBuilder: (BuildContext context, int index) {
                final item = snapshot.data[index];
                return ListTile(
                  title: Text(item['name']),
                  subtitle: Text(item['email']),
                );
              },
            );
          },
        ),
      ),
    );
  }
}

Answer 1

您必须将手机和计算机保持相同的网络网络连接。

然后假设您的ip和url是此192.168.1.102:8000，则传递您的url

static const url= "192.168.1.102:8000/association/api/membres";