【发布时间】：2021-03-25 06:17:17
【问题描述】：
我正在尝试开发一个颤振应用程序，该应用程序将 http 请求发送到托管在 000webHost 上的远程 php 文件。
当我为桌面构建 Flutter 应用程序时，我设法检索信息，一切都很好。但是，由于另一个问题（视频播放器不适用于 Desktop....），我想回到 Web 构建。
我查看了几篇帖子，但没有发现与我类似的错误。有人说是由于跨域请求 (CORS) 导致的错误，但在我看来这不是这个问题。
当我尝试使用 http.post 检索数据时，出现以下错误：
browser_client.dart:87 POST https://<myadresse>.000webhostapp.com/<nameFile>.php net::ERR_HTTP2_PROTOCOL_ERROR
Uncaught (in promise) 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 (errors.dart:249)
at Object._rethrow (async_patch.dart:200)
at async._AsyncCallbackEntry.new.callback (zone.dart:1171)
at Object._microtaskLoop (schedule_microtask.dart:41)
at _startMicrotaskLoop (schedule_microtask.dart:50)
at async_patch.dart:166
我的代码：
void fetchData() async {
/**Map for instructions with php**/
var map = Map<String, dynamic>();
HandlerResponse
handlerResponse2; //Use to manage errors and parsing of received responses
map['action'] = Constants.GET_ALL_OPERATIONS;
try {
//Retrieving the response with the file containing the accesses to the database
http.Response responseCall = await http.post(Constants.ROOT,
body: map, headers: {"Access-Control-Allow-Origin": "*" , "Access-Control-Allow-Credentials": "true"});
//Definition of the behavior to adopt upon receipt of the response
handlerResponse2 = HandlerResponse(parseReponse: parseResponse);
//Recovery of response processing
_operations =
handlerResponse2.response(responseCall); //response(responseCall);
//Notify the change to widgets using the provider to update the interface
notifyListeners();
} on SocketException {
throw FetchDataException('No Internet connection');
}
}
当我使用颤振医生时：
flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel dev, 1.25.0-4.0.pre, on Microsoft Windows [version 10.0.18362.900], locale fr-FR)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.4.5)
[√] Android Studio (version 4.0)
[√] Connected device (3 available)
• No issues found!
提前感谢您的帮助
【问题讨论】：
-
这是一个服务器端错误。您必须将这些标头添加到您的 服务器。
-
我尝试在 php 端添加这个：stackoverflow.com/a/9866124/14824303 和 call ，但它是同样的错误。
标签： flutter http flutter-web