javascript-Angular http模块-帖子标题

使用Angular中的http模块(带有Ionic)执行发布请求时,无法更改标题.
这是我的代码：

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

const apiUrl = "https://webhook.site/c2d56330-84d4-47cf-9f98-472f7eac8000";

@Injectable({
  providedIn: 'root'
})
export class APIService {

  constructor(private http: HttpClient) { }

  getToken(){
    var body = {
      'data1': 'data2',
      'somedata3': 'data4',
  };
  let headers = new HttpHeaders().append('Content-Type', 'application/json');

  this.http.post(apiUrl, JSON.stringify(body), {headers}).subscribe(data =>
    console.log(data));

  console.log(headers.get('Content-Type')); //return 'application/json'
  }
}

一切正常,但仍发送标头“ content-type：text / plain”,而不是“ content-type：application / json”.

我打错了吗？

解决方法:

我更喜欢这样的东西：

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

const httpOptions = {
  headers: new HttpHeaders({
    'Content-Type':  'application/json'
  })
};
this.http.post<Foo>(this.apiUrl, body, httpOptions)

另外,我不认为需要对主体进行字符串化,只需将其作为“正常”对象传递即可