我试图用flutter制作一个RSS的阅读器，但程序引发了XMLHttpRequest错误。
在我的测试中，我使用web（Chrome）作为我的目标平台。
谢谢你的帮助。
Future<RssFeed> fetchFeed() async {
try {
final response = await http.get(Uri.parse(url), headers: {"Access-Control-Allow-Origin": "*"});
return RssFeed.parse(response.body);
} catch (e) {
print(e);
return RssFeed(title: "Test");
}}
var feed = await fetchFeed();
完整的错误日志：
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 910:28 get current
packages/http/src/browser_client.dart 69:22 <fn>
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1685:54 runUnary
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 159:18 handleValue
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 766:44 handleValueCallback
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 795:13 _propagateToListeners
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 592:7 [_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 1288:7 <fn>
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 334:14 _checkAndCall
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 339:39 dcall
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/html/dart2js/html_dart2js.dart 37301:58 <fn>
at Object.createErrorWithStack (http://localhost:49656/dart_sdk.js:5080:12)
at Function._throw (http://localhost:49656/dart_sdk.js:20337:18)
at Function.throwWithStackTrace (http://localhost:49656/dart_sdk.js:20334:18)
at async._AsyncCallbackEntry.new.callback (http://localhost:49656/dart_sdk.js:40851:18)
at Object._microtaskLoop (http://localhost:49656/dart_sdk.js:40708:13)
at _startMicrotaskLoop (http://localhost:49656/dart_sdk.js:40714:13)
at http://localhost:49656/dart_sdk.js:36191:9
Flutter医生输出：
[√] Flutter (Channel stable, 2.10.1, on Microsoft Windows [Version 10.0.19042.1526], locale de-DE)
[√] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Community 2022 17.0.5)
[√] Android Studio (version 2021.1)
[√] VS Code (version 1.63.2)
[√] Connected device (4 available)
[√] HTTP Host Availability
依赖关系：
dependencies:
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^1.0.2
url_launcher: ^6.0.20
http: ^0.13.0
flutter_staggered_grid_view: ^0.6.1
calendar_view: ^0.0.3
webfeed: ^0.7.0
string_similarity: ^2.0.0
sortedmap: ^0.5.1
感谢@Reza M，我可以发现问题。我在Web配置中缺少'--disable-web-security'。
1-转到flutter\bin\cache并删除一个名为：flutter_tools的文件。
2-转到flutter\flutter_tools\lib\src\web并打开文件chrome. dart。
3-查找'--disable-扩展'
4-添加'--disable-web-security'
颤振的说明来自@Osman Tuzcu的这篇文章。
此错误的原因是当您使用Uri. parse（url）时，您应该使用Uri.https（'urlPath'，'callPath'）（例如：Uri.https（'api.to.Consults'，'login'）），我花了几天时间寻找解决方案，直到我更改此方案才奏效。我希望它能帮助某人。示例
...
var uri = Uri.https('my.apiurl.com', 'my/api/endopoint/path');
var response = await client.get(uri);
...
您可能会注意到'my.apiurl.com'不包括"超文本传输协议：//"或"https：//"，如果它携带任何一个协议，您应该酌情调用Uri. http或Uri.https。
另请注意，“my/api/endopoint/path”是要查询的endpoint的路径，例如“api/用户/登录”或“api/类别”。
我尝试了很多解决方案，但我们只是在您的请求中使用以下标头：
headers: {
"Access-Control-Allow-Origin": "*",
'Content-Type': 'application/json',
'Accept': '*/*'
}
并确保您在请求中使用https
