当部署到设备时，Http请求在ionic应用程序中不起作用

{
  "name": "your-app-name",
  "integrations": {
    "angular": {}
  },
  "type": "angular",
  "proxy": {
    "/api": {
      "target": "http://your-backend-server.com",
      "secure": false,
      "changeOrigin": true,
      "logLevel": "debug"
    }
  }
}

<uses-permission android:name="android.permission.INTERNET"/>

import { HttpClient } from '@angular/common/http';

constructor(private http: HttpClient) {}

getData() {
  this.http.get('http://your-backend-server.com/api/data').subscribe(data => {
    console.log(data);
  }, error => {
    console.error('Error fetching data', error);
  });
}

import { HttpClient, HttpClientModule } from '@angular/common/http';
import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { HttpInterceptor } from '@angular/common/http';
import { Observable } from 'rxjs';
import { tap } from 'rxjs/operators';

export class NoopInterceptor implements HttpInterceptor {
  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    const httpOptions = {
      ...req.options,
      withCredentials: true,
      headers: new HttpHeaders({
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type, Authorization'
      })
    };
    return next.handle(req.clone(httpOptions)).pipe(
      tap({
        error: (err) => {
          if (err instanceof HttpErrorResponse && err.status === 0) {
            console.error('Network error occurred');
          }
        }
      })
    );
  }
}

@NgModule({
  imports: [HttpClientModule],
  providers: [
    { provide: HTTP_INTERCEPTORS, useClass: NoopInterceptor, multi: true }
  ]
})
export class AppModule {}