如何在angular中获取响应头

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

constructor(private http: HttpClient) { }

this.http.get(url, { observe: 'response' }).subscribe(response => {
  // 在这里处理响应
});

const contentType = response.headers.get('Content-Type');

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

@Component({
  selector: 'app-example',
  template: `
    <button (click)="getData()">获取数据</button>
  `
})
export class ExampleComponent {
  constructor(private http: HttpClient) { }

  getData() {
    this.http.get(url, { observe: 'response' }).subscribe(response => {
      const contentType = response.headers.get('Content-Type');
      console.log(contentType);
    });
  }
}