[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: DioError [DioErrorType.DEFAULT]: RangeError (index): Invalid value: Only valid value is 0: 1#0 List.[] (dart:core-patch/growable_array.dart:145:60)

[Q14]

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Issue Info

Info	Value
Platform Name ios 模拟器
Platform Version	12.0
Dio Version	2.1.0
Android Studio / Xcode Version	Android Studio 3.3.2
Repro rate	e.g. all the time (100%) / sometimes x% / only once
Repro with our demo prj	e.g. does it happen with our demo project?
Demo project link	e.g. link to a demo project that highlights the issue

Issue Description and Steps

Unhandled Exception: DioError [DioErrorType.DEFAULT]: RangeError (index): Invalid value: Only valid value is 0: 1#0 List.[] (dart:core-patch/growable_array.dart:145:60)
#1 RequestOptions.uri (package:dio/src/options.dart:217:29)
#2 DefaultHttpClientAdapter.fetch (package:dio/src/adapter.dart:120:67)

#3 Dio._makeRequest (package:dio/src/dio.dart:735:46)

#4 Dio._request.. (package:dio/src/dio.dart:707:22)
#5 _rootRunUnary (dart:async/zone.dart:1132:38)
#6 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#7 _FutureListener.handleValue (dart:async/future_impl.dart:126:18)
#8 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:639:45)
#9 Future._propagateToListeners (dart:async/future_impl.dart:668:32)
#10 Future._complete (dart:async/future_impl.dart:473:7)
#11 _SyncCompleter.complete (dart:async/<…>

[MonkeyInWind]

+1
dart写的接口 postman web都可以调用

[MonkeyInWind]

找到原因了 android模拟器把宿主机ip指定为了10.0.2.2 所以不要访问电脑的ip 要访问10.0.2.2这个ip @Q14

[lilong7676]

楼上正解，只要url无效，就会报这个错。

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If this is still an issue, please make sure it is up to date and if so, add a comment that this is still an issue to keep it open. Thank you for your contributions.

[dxjdqc]

找到原因了 android模拟器把宿主机ip指定为了10.0.2.2 所以不要访问电脑的ip 要访问10.0.2.2这个ip @Q14

请问下，我用的是真机测试也报这个错，怎么解决呢

[amreniouinnovent]

my base URL in dio was empty "" now solved

[wendux]

如果该问题还存在，请按模板补全信息，然后给出最小的可复现步骤后再重新打开

From gitme Android

[hjJunior]

I got the same error, but in my case, it was because my base URL in dio was missing the http prefix