使用Angular HTTP客户端-如何发送带有所有属性的POST http对象，但默认为` `null

const postData = {
  property1: null,
  property2: null,
  // 其他属性...
};

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

@Injectable()
export class MyService {
  constructor(private http: HttpClient) {}

  sendData() {
    const url = 'https://example.com/api/endpoint'; // 替换为实际的API端点URL
    this.http.post(url, postData).subscribe(
      response => {
        console.log('请求成功', response);
        // 处理响应数据
      },
      error => {
        console.error('请求失败', error);
        // 处理错误
      }
    );
  }
}

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

// ...

sendData() {
  const url = 'https://example.com/api/endpoint'; // 替换为实际的API端点URL

  const headers = new HttpHeaders({
    'Content-Type': 'application/json',
    // 其他请求头...
  });

  const options = {
    headers: headers,
    observe: 'events' // 或 'response'、'body'，根据需要选择
    // 其他选项...
  };

  this.http.post(url, postData, options).subscribe(
    // ...
  );
}