如何使用Angular在POST请求体中发送字符串值？

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

constructor(private http: HttpClient) { }

sendStringData() {
  const url = 'https://example.com/api/endpoint'; // 替换为实际的API端点URL
  const data = 'Hello, World!'; // 要发送的字符串值

  this.http.post(url, data).subscribe(response => {
    console.log('请求成功', response);
  }, error => {
    console.error('请求失败', error);
  });
}

<button (click)="sendStringData()">发送POST请求</button>