ios - SocketException (SocketException : Failed host lookup: 'test' (OS Error: nodename nor servname provided, or not known, errno = 8))

Question

我看过别处，每个网站都告诉我这实际上是互联网连接错误......但我知道这不可能是正确的。

我正在使用 Flutter (dart) 为 iOS(在 Mac 上)编程。我在 iOS 模拟器和实际的 iPhone 上都试过这个，我得到了同样的错误。对同一服务器的其他调用工作正常。

Future<Map> createTrip() async {

  http.Response response = await http.post(
    url,
    headers: <String, String>{'authorization': basicAuth},
    body: {'user_phone': user_phone, 'locationId1': locationId1, 'locationId2': locationId2},

  );
  info  = jsonDecode(response.body);
  sessionID = info['session_id'];
  print (info['session_id']);
  return info;
}

工作正常。在响应正文中，它包含 session_id，并且 print-screen 证明此变量不为空。

但是这个:

Future<Map> getServerData(sessionID) async {
  url = url + sessionID; //. <---  adding sessionID to end of a url-address 
  http.Response response = await http.get(
    url,
    headers: <String, String>{'authorization': basicAuth},
  );
  Map data = jsonDecode(response.body);
  return data;
}

不工作。不完全确定为什么。我什至尝试在 info.plist 中允许不安全的数据传输到服务器。

我的理解或期望是，这可能是因为服务器上不存在我请求的 url？这是唯一对我有意义的事情。如果不是，那可能是什么？

Flutter Doctor 结果:

[✓] Flutter (Channel master, v1.14.2-pre.54, on Mac OS X 10.15.2 19C57, locale
    en-CA)
    • Flutter version 1.14.2-pre.54 at /Users/iosdev/Developer/flutter
    • Framework revision da0bfd1c93 (32 hours ago), 2020-01-21 05:59:07 -0500
    • Engine revision c15efb9231
    • Dart version 2.8.0 (build 2.8.0-dev.3.0 f910a7575f)


[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/iosdev/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling
      support)
    • Platform android-29, build-tools 29.0.2
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C504
    • CocoaPods version 1.8.4

[✓] Android Studio (version 3.5)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 42.1.1
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build
      1.8.0_202-release-1483-b49-5587405)

[✓] Connected device (2 available)
    • Phillip’s iPhone  • 52a4fba45a6767b88e4dddd881201205138cac0e • ios • iOS
      13.3
    • iPhone 11 Pro Max • 2F6FBCBE-CC96-4044-84FA-0DE39E441830     • ios •
      com.apple.CoreSimulator.SimRuntime.iOS-13-3 (simulator)

• No issues found!

Answer 1

确保您的模拟器或设备上有互联网。通过在模拟器或设备上打开 Internet 浏览器来检查 google.com 是否会成功显示