javascript - 如何以 Angular 将自定义 header 添加到httpRequest

Question

我正在尝试通过在 headers 中传递一些值来发出 http get() 请求，现在我将像这样替换headers:

import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Injectable } from '@angular/core';
import {ICustomer} from 'src/app/models/app-models';

@Injectable({
  providedIn: 'root'
})
export class MyService {
private baseUrl = '....api url....';
public authKey = '....auth_key......';

  constructor(private http: HttpClient) { }

  public async AllCustomers(): Promise<ICustomer[]> {
   const apiUrl = `${this.baseUrl}/customers`;

   return this.http.get<ICustomer[]>(apiUrl ,
    {headers: new HttpHeaders({Authorization: this.authKey})}).toPromise();<=====
  }

}

当我像这样替换标题时:

header :new HttpHeaders({Authorization: this.authKey})

默认 header 值(即 Content-Type : application/json)将被上述 header 替换。

我没有替换标题，而是如何添加自定义标题，我尝试了这样的操作:

  public async AllCustomers(): Promise<ICustomer[]> {
    const apiUrl = `${this.baseUrl}/courses`;
    const headers = new HttpHeaders();
    headers.append('Authorization', this.authKey);
    headers.append('x-Flatten', 'true');
    headers.append('Content-Type', 'application/json');

    return this.http.get<ICustomer[]>(apiUrl).toPromise();
  }

我的方法有什么问题，我是Angular新手，有什么帮助吗？

Answer 1

您应该像这样将 header 添加到您的获取请求中。另外，由于 HttpHeaders 是不可变对象(immutable对象)，因此您必须重新分配 header 对象

  public async AllCustomers(): Promise<ICourses[]> {
    const apiUrl = `${this.baseUrl}/courses`;
    let headers = new HttpHeaders();
    headers = headers.append('Authorization', this.authKey);
    headers = headers.append('x-Flatten', 'true');
    headers = headers.append('Content-Type', 'application/json');

    return this.http.get<ICourses[]>(apiUrl, {headers}).toPromise();
  }