get json from api (flutter web) - asp.net

Question

when i try another url worked and get json
like: http://api.mp3quran.net/api/surah?surah=1&language=en
but this link not work
link:http://qualityproject-001-site1.ctempurl.com/api/v1/Policy
note: this api built by asp.core
import 'package:http/http.dart';
fetchPost() async {
//http://api.mp3quran.net/api/surah?surah=1&language=en (this work with flutter & flutter_web)
//http://qualityproject-001-site1.ctempurl.com/api/v1/Policy (but this not work with flutter_web and work with flutter)
Response response =
await get('http://qualityproject-001-site1.ctempurl.com/api/v1/Policy');
print(response.body);
}
Flutter crash report; please file at https://github.com/flutter/flutter/issues.
command
flutter run --machine --target lib\main.dart -d chrome --track-widget-creation --start-paused
exception
NoSuchMethodError: NoSuchMethodError: The method 'toJson' was called on null.
Receiver: null
Tried calling: toJson()
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1 SourceLocation.toJson (package:vm_service/vm_service.dart:5024:24)
#2 Frame.toJson (package:vm_service/vm_service.dart:3296:47)
#3 Event.toJson (package:vm_service/vm_service.dart:3022:47)
#4 VmServerConnection._delegateRequest.<anonymous closure> (package:vm_service/vm_service.dart:1141:28)
#5 _rootRunUnary (dart:async/zone.dart:1132:38)
#6 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#7 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
#8 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#9 _DelayedData.perform (dart:async/stream_impl.dart:591:14)
#10 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:707:11)
#11 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:667:7)
#12 _rootRun (dart:async/zone.dart:1120:38)
#13 _CustomZone.run (dart:async/zone.dart:1021:19)
#14 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#15 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#16 _rootRun (dart:async/zone.dart:1124:13)
#17 _CustomZone.run (dart:async/zone.dart:1021:19)
#18 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#19 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#20 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#21 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#22 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:116:13)
#23 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:173:5)
flutter doctor
[✓] Flutter (Channel unknown, v1.10.2-pre.40, on Microsoft Windows [Version 10.0.17134.1006], locale en-US)
• Flutter version 1.10.2-pre.40 at C:\flutter\flutter
• Framework revision b4ab5cfe79 (29 hours ago), 2019-09-16 20:34:25 -0700
• Engine revision 7ea9884ab0
• Dart version 2.5.0 (build 2.5.0-dev.4.0 be66176534)
[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at C:\flutter\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• ANDROID_HOME = C:\flutter\sdk
• Java binary at: C:\flutter\android-studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b01)
✗ Android license status unknown.
Try re-installing or updating your Android SDK Manager.
See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.
[✓] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
[✓] Android Studio (version 3.3)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 34.0.1
• Dart plugin version 182.5215
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)
[✓] Android Studio (version 3.5)
• Android Studio at C:\flutter\android-studio
• Flutter plugin version 34.0.4
• Dart plugin version 191.6183.88
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b01)
[✓] VS Code (version 1.38.1)
• VS Code at C:\Users\Mahmoud salah eldin\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.4.1
[✓] Connected device (2 available)
• Chrome • chrome • web-javascript • Google Chrome 76.0.3809.132
• Server • web • web-javascript • Flutter Tools
! Doctor found issues in 1 category.

Answer 1

Do the import this way..
import 'package:http/http.dart' as http;
Then
var a = http.get(xyz);