如何在angular ionic中使用摘要认证发送请求

import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class ApiService {
  private apiUrl = 'https://example.com/api';
  private username = 'yourUsername';
  private password = 'yourPassword';

  constructor(private http: HttpClient) {}

  getWithDigestAuth() {
    const headers = new HttpHeaders();
    headers.set('Authorization', this.createDigestAuthHeader('GET', '/api'));

    return this.http.get(this.apiUrl, { headers });
  }

  private createDigestAuthHeader(method: string, uri: string) {
    const ha1 = md5(`user:${this.realm}:${this.username}`);
    const ha2 = md5(`${method}:${uri}`);
    const response = md5(`${ha1}:${this.nonce}:${ha2}`);

    return `Digest username="${this.username}", realm="${this.realm}", nonce="${this.nonce}", uri="${uri}", response="${response}"`;
  }
}