如何在angular

Question

我正在尝试通过在http get()中传递一些values来发出headers请求，现在我像这样替换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();<=====
  }

}

当我替换标题时：

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

默认标头值（即Content-Type：application / json）将由上述标头替换。

我没有尝试替换标头，而是添加custom headers，而是这样尝试：

  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的新手，有帮助吗？

Answer 1

您应该像这样将标头添加到您的get请求中。另外，由于HttpHeaders是不可变的对象，因此您必须像这样编写

  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();
  }

Answer 2

我认为您忘记了在请求中添加标头对象

来自

AlarmManager

收件人

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

Answer 3

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


constructor(private _http: HttpClient) { 

}


public getHeaders(): HttpHeaders {
  const headers = new HttpHeaders({
    'Content-Type':  'application/json',
    'Authorization': `Bearer ${this._auth.token}`
  });
  return headers;
}


public getData() {
  const url     = `https://stackoverflow.com/api/test`;
  const body    = { };
  const options = { headers: this.getHeaders() };
  return this._http.post<any>(url, body, options);
}