颤振web获取XMLHttpRequest

Question

我的应用程序在android上运行得很好，但在网络上，我得到了错误：

错误: XMLHttpRequest错误。dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart

我使用生成Json数据的PHP，我已经添加了标题：

header("Access-Control_Allow_Origin: *");
header("Content-type:application/json;charset=utf-8"); 
header("Access-Control-Allow-Methods: GET");

错误输出：

Error: XMLHttpRequest error.
dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 908:28                get current
packages/http/src/browser_client.dart 69:22                                       <fn>
dart-sdk/lib/async/zone.dart 1687:54                                              runUnary
dart-sdk/lib/async/future_impl.dart 160:18                                        handleValue
dart-sdk/lib/async/future_impl.dart 767:44                                        handleValueCallback
dart-sdk/lib/async/future_impl.dart 796:13                                        _propagateToListeners
dart-sdk/lib/async/future_impl.dart 593:7                                         [_complete]
dart-sdk/lib/async/stream_pipe.dart 61:11                                         _cancelAndValue
dart-sdk/lib/async/stream.dart 1232:7                                             <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 334:14  _checkAndCall
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 339:39  dcall
dart-sdk/lib/html/dart2js/html_dart2js.dart 37332:58                              <fn>
    at Object.createErrorWithStack (http://localhost:52772/dart_sdk.js:5388:12)
    at Object._rethrow (http://localhost:52772/dart_sdk.js:40987:16)
    at async._AsyncCallbackEntry.new.callback (http://localhost:52772/dart_sdk.js:40981:13)
    at Object._microtaskLoop (http://localhost:52772/dart_sdk.js:40808:13)
    at _startMicrotaskLoop (http://localhost:52772/dart_sdk.js:40814:13)
    at http://localhost:52772/dart_sdk.js:36279:9

Answer 1

它在遵循那些steps之后工作

1-转到flutter\bin\cache并删除一个名为: flutter_tools.stamp的文件

2-转到flutter\packages\flutter_tools\lib\src\web并打开文件chrome.dart。

3-找到‘-禁用-扩展’

4-添加“禁用-网络-安全”

Answer 2

我在网上部署时遇到了同样的问题，请确保：

• 将头添加到.htaccess文件中。
• 最好使用POST而不是GET。
• 在.htaccess代码中使用HTTPS而不是HTTP。