在 WEB 中运行 Flutter：错误：XMLHttpRequest 错误

Posted 2023-02-23

【中文标题】在 WEB 中运行 Flutter：错误：XMLHttpRequest 错误

【英文标题】：Running Flutter in WEB : Error: XMLHttpRequest error

【发布时间】：2021-04-12 15:30:01

【问题描述】：

我在 Flutter 中构建了一个可以作为 android 应用程序完美运行的应用程序，但是当我尝试在 Chrome 中运行相同的应用程序时，我收到以下错误。正如您在错误中看到的，我没有对我的代码的任何引用，仅用于“dart-sdk/lib”。

我该如何解决这个问题？

**** 错误信息 ****

Launching lib\main.dart on Chrome in debug mode...

Waiting for connection from debug service on Chrome...

Debug service listening on ws://127.0.0.1:52742/ewRwL069luw=/ws

Running with unsound null safety

For more information see https://dart.dev/null-safety/unsound-null-safety

Debug service listening on ws://127.0.0.1:52742/ewRwL069luw=/ws

Error: XMLHttpRequest error.

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 906:28                get current

packages/http/src/browser_client.dart 84:22                                                                                    <fn>

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1446:54                                              runUnary

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 150:18                                        handleValue

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 703:44                                        handleValueCallback

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 732:32                                        _propagateToListeners

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 526:7                                         [_complete]

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/stream_pipe.dart 61:11                                         _cancelAndValue

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/stream.dart 1302:7                                             <fn>

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 324:14  _checkAndCall

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 329:39  dcall

C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/html/dart2js/html_dart2js.dart 37312:58                              <fn>


    at Object.createErrorWithStack (http://localhost:52678/dart_sdk.js:4368:12)
    at Object._rethrow (http://localhost:52678/dart_sdk.js:38289:16)
    at async._AsyncCallbackEntry.new.callback (http://localhost:52678/dart_sdk.js:38283:13)
    at Object._microtaskLoop (http://localhost:52678/dart_sdk.js:38115:13)
    at _startMicrotaskLoop (http://localhost:52678/dart_sdk.js:38121:13)
    at http://localhost:52678/dart_sdk.js:33618:9

【参考方案1】：

您是否在发出网络请求？

如果是这样，您需要更改后端的 CORS 政策以允许这样做。

View here