无法使用 Flutter 调用 Localhost，随机端口被分配给 HTTP GET 调用

Question

我正在尝试构建一个 Flutter 应用程序，我需要使用 dart http library 进行 HTTP 调用。所以这是我用来打电话的 fu 的片段，

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

Future<List> getData() async {
    List data = new List();
    var httpClient = new HttpClient();
    var request = await httpClient.get("localhost", 5000, '/search?query=hello');
    var response = await request.close();
    if (response.statusCode == HttpStatus.OK) {
      var jsonString = await response.transform(utf8.decoder).join();
      data = json.decode(jsonString);
      print(data);
      return data;
    } else {
      return data;
    }
  }

现在从我的代码调用 getData()，这是我得到的错误

E/flutter (30949): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (30949): SocketException: OS Error: Connection refused, errno = 111, address = localhost, port = 46999
E/flutter (30949): #0      _HomePageState.getData (file:///home/bholagabbar/AndroidStudioProjects/fnd_modile_client/lib/main.dart:75:19)
E/flutter (30949): <asynchronous suspension>
E/flutter (30949): #1      _HomePageState.build.<anonymous closure> (file:///home/bholagabbar/AndroidStudioProjects/fnd_modile_client/lib/main.dart:56:15)
E/flutter (30949): #2      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:478:14)
E/flutter (30949): #3      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:530:30)
E/flutter (30949): #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter (30949): #5      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter (30949): #6      TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:94:7)
E/flutter (30949): #7      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
E/flutter (30949): #8      PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
E/flutter (30949): #9      PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
E/flutter (30949): #10     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:143:19)
E/flutter (30949): #11     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter (30949): #12     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (30949): #13     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter (30949): #14     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter (30949): #15     _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter (30949): #16     _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)

我的 API 已启动并且运行正确，如您在错误日志中所见，请求似乎没有通过。这里的问题到底是什么？

郑重声明，我已经尝试了 get、getUrl 的所有排列，甚至尝试用 10.0.2.2 替换 localhost 和 127.0.0.1，如。我直接在 phone 上测试这个 (One Plus 3)

Answer 1

应该这样做

adb reverse tcp:5000 tcp:5000

https://developer.android.com/studio/command-line/adb.html

或使用adb reverse --list查看设置了哪些重定向。

Answer 2

Günter 的回答是正确的，但您需要记住一件事，那就是不要忘记更改端口号例如，如果您的端口是 3002，则使用：

adb reverse tcp:3002 tcp:3002

请记住，上述命令会将您的 phone 端口 3002 重定向到您计算机的端口 3002。

如果您想将 phone 的端口 3000 重定向到计算机的端口 3002，则命令如下所示

adb reverse tcp:3000 tcp:3002

更一般的答案是：

adb reverse tcp:<Your Phone's Port No.> tcp:<Your Computer's Port No>

无法使用 Flutter 调用 Localhost，随机端口被分配给 HTTP GET 调用

Unable to make calls to Localhost using Flutter, random port being assigned to HTTP GET call

dart

dart-http

flutter