问题描述
我正在使用 dart2js 创建 firebase 函数。在这样的函数中，我必须为某些 Web api 调用 http 请求（在本例中是对 www.google.com :-) 的简单网站请求），但得到“ReferenceError: XMLHttpRequest is not defined”。在 Android 或 iOS 上的 Dart 应用程序中运行相同的代码工作正常。我正在使用 https://pub.dev/packages/http。
import 'package:http/http.dart' as http;
class ExecuteHttpRequest {
Future<void> execute() async {
Uri getUri = Uri.https('www.google.com','');
final response = await http.get(getUri);
if (response.statusCode == 200) print('success');
}
}
import 'package:node_io/node_io.dart';
import 'package:firebase_functions_interop/firebase_functions_interop.dart';
import 'package:nodejs_test/ExecuteHttpRequest.dart';
void main() {
functions['executeHttpRequest'] = functions.https.onRequest((ExpressHttpRequest request) async {
await ExecuteHttpRequest().execute();
request.response
..headers.contentType = ContentType.text
..write("success :-)")
..close();
});
}
在构建和执行时，我得到以下信息：
% pub run build_runner build -o node:build
[INFO] Generating build script completed,took 301ms
[WARNING] The package `nodejs_test` does not include some required sources in any of its targets (see their build.yaml file).
The missing sources are:
- $package$
[INFO] Reading cached asset graph completed,took 178ms
[INFO] Checking for updates since last build completed,took 611ms
[INFO] Running build completed,took 184ms
[INFO] Caching finalized dependency graph completed,took 117ms
[INFO] Reading manifest at build/.build.manifest completed,took 0ms
[INFO] Deleting prevIoUs outputs in `build` completed,took 144ms
[INFO] Creating merged output dir `build` completed,took 614ms
[INFO] Writing asset manifest completed,took 3ms
[INFO] Succeeded after 1.1s with 0 outputs (0 actions)
% firebase emulators:start
i emulators: Starting emulators: functions,firestore,database,hosting
⚠ functions: The following emulators are not running,calls to these services from the Functions emulator will affect production: auth,pubsub
⚠ Your requested "node" version "10" doesn't match your global version "14"
i firestore: Firestore Emulator logging to firestore-debug.log
i database: Database Emulator logging to database-debug.log
⚠ hosting: Authentication error when trying to fetch your current web app configuration,have you run firebase login?
⚠ hosting: Could not fetch web app configuration and there is no cached configuration on this machine. Check your internet connection and make sure you are authenticated. To continue,you must call firebase.initializeApp({...}) in your code before using Firebase.
i hosting[nodejs-test]: Serving hosting files from: public
✔ hosting[nodejs-test]: Local server: http://localhost:5000
i ui: Emulator UI logging to ui-debug.log
i functions: Watching "/Users/stefano/development/nodejs-test/functions" for Cloud Functions...
✔ functions[executeHttpRequest]: http function initialized (http://localhost:5001/nodejs-test/us-central1/executeHttpRequest).
┌─────────────────────────────────────────────────────────────┐
│ ✔ All emulators ready! It is Now safe to connect your app. │
│ i View Emulator UI at http://localhost:4000 │
└─────────────────────────────────────────────────────────────┘
┌───────────┬────────────────┬─────────────────────────────────┐
│ Emulator │ Host:Port │ View in Emulator UI │
├───────────┼────────────────┼─────────────────────────────────┤
│ Functions │ localhost:5001 │ http://localhost:4000/functions │
├───────────┼────────────────┼─────────────────────────────────┤
│ Firestore │ localhost:8080 │ http://localhost:4000/firestore │
├───────────┼────────────────┼─────────────────────────────────┤
│ Database │ localhost:9000 │ http://localhost:4000/database │
├───────────┼────────────────┼─────────────────────────────────┤
│ Hosting │ localhost:5000 │ n/a │
└───────────┴────────────────┴─────────────────────────────────┘
Emulator Hub running at localhost:4400
Other reserved ports: 4500
Issues? Report them at https://github.com/firebase/firebase-tools/issues and attach the *-debug.log files.
i functions: Beginning execution of "executeHttpRequest"
> /Users/stefano/development/nodejs-test/functions/build/index.dart.js:8378
> throw error;
> ^
>
> ReferenceError: XMLHttpRequest is not defined
> at /Users/stefano/development/nodejs-test/functions/build/index.dart.js:10055:15
> at _wrapJsFunctionForAsync_closure.$protected (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3431:15)
> at _wrapJsFunctionForAsync_closure.call$2 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7301:12)
> at _awaitOnObject_closure.call$1 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7287:32)
> at _RootZone.runUnary$2$2 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:8450:18)
> at _Future__propagatetoListeners_handleValueCallback.call$0 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7689:61)
> at Object._Future__propagatetoListeners (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3530:104)
> at _Future._completeWithValue$1 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7502:9)
> at _Future__asyncComplete_closure.call$0 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7604:10)
> at Object._microtaskLoop (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3593:21) {
> dartException: <ref *1> ReferenceError: XMLHttpRequest is not defined
> at /Users/stefano/development/nodejs-test/functions/build/index.dart.js:10055:15
> at _wrapJsFunctionForAsync_closure.$protected (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3431:15)
> at _wrapJsFunctionForAsync_closure.call$2 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7301:12)
> at _awaitOnObject_closure.call$1 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7287:32)
> at _RootZone.runUnary$2$2 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:8450:18)
> at _Future__propagatetoListeners_handleValueCallback.call$0 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7689:61)
> at Object._Future__propagatetoListeners (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3530:104)
> at _Future._completeWithValue$1 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7502:9)
> at _Future__asyncComplete_closure.call$0 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7604:10)
> at Object._microtaskLoop (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3593:21) {
> '$cachedTrace': _StackTrace {
> _exception: [Circular *1],> _trace: 'ReferenceError: XMLHttpRequest is not defined\n' +
> ' at /Users/stefano/development/nodejs-test/functions/build/index.dart.js:10055:15\n' +
> ' at _wrapJsFunctionForAsync_closure.$protected (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3431:15)\n' +
> ' at _wrapJsFunctionForAsync_closure.call$2 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7301:12)\n' +
> ' at _awaitOnObject_closure.call$1 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7287:32)\n' +
> ' at _RootZone.runUnary$2$2 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:8450:18)\n' +
> ' at _Future__propagatetoListeners_handleValueCallback.call$0 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7689:61)\n' +
> ' at Object._Future__propagatetoListeners (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3530:104)\n' +
> ' at _Future._completeWithValue$1 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7502:9)\n' +
> ' at _Future__asyncComplete_closure.call$0 (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:7604:10)\n' +
> ' at Object._microtaskLoop (/Users/stefano/development/nodejs-test/functions/build/index.dart.js:3593:21)'
> }
> }
> }
解决方法
现在我自己解决了这个问题:-)
你必须使用
import 'package:node_http/node_http.dart' as http;
代替
import 'package:http/http.dart' as http;