使用async和await成功扫描条形码后，Ionic Angular http get未触发

import { Component } from '@angular/core';
import { BarcodeScanner } from '@ionic-native/barcode-scanner/ngx';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-home',
  templateUrl: 'home.page.html',
  styleUrls: ['home.page.scss'],
})
export class HomePage {
  constructor(private barcodeScanner: BarcodeScanner, private http: HttpClient) {}

  async scanBarcode() {
    try {
      const barcodeData = await this.barcodeScanner.scan();
      const barcodeValue = barcodeData.text;
      await this.sendHttpGetRequest(barcodeValue);
    } catch (error) {
      console.error('Error scanning barcode:', error);
    }
  }

  async sendHttpGetRequest(barcodeValue: string) {
    try {
      const url = 'http://example.com/api/barcode';
      const params = { barcode: barcodeValue };
      const response = await this.http.get(url, { params }).toPromise();
      console.log('HTTP response:', response);
      // 处理响应结果
    } catch (error) {
      console.error('Error sending HTTP request:', error);
    }
  }
}