const headers = new HttpHeaders()
  .set('content-type', 'application/json')
  .set('x-functions-key', '');

return this.http.get<Person[]>(baseUrl, {
      headers: headers,
    });

使用append方法将新值附加到现有值集

headers.append('Access-Control-Allow-Origin', '*')

像下面这样保持独立的服务怎么样

            import {Injectable} from '@angular/core';
            import {Headers, Http, RequestOptions} from '@angular/http';


            @Injectable()
            export class HttpClientService extends RequestOptions {

                constructor(private requestOptionArgs:RequestOptions) {
                    super();     
                }

                addHeader(headerName: string, headerValue: string ){
                    (this.requestOptionArgs.headers as Headers).set(headerName, headerValue);
                }
            }

当你从另一个地方调用这个时，使用this. httpclientservice。addHeader("Authorization"， " holder " + this.tok);

您将看到添加的标题，例如:-授权如下

在Angular 2.1.2中，我通过扩展Angular Http来解决这个问题:

import {Injectable} from "@angular/core";
import {Http, Headers, RequestOptionsArgs, Request, Response, ConnectionBackend, RequestOptions} from "@angular/http";
import {Observable} from 'rxjs/Observable';

@Injectable()
export class HttpClient extends Http {

  constructor(protected _backend: ConnectionBackend, protected _defaultOptions: RequestOptions) {

    super(_backend, _defaultOptions);
  }

  _setCustomHeaders(options?: RequestOptionsArgs):RequestOptionsArgs{
    if(!options) {
      options = new RequestOptions({});
    }
    if(localStorage.getItem("id_token")) {

      if (!options.headers) {

        options.headers = new Headers();


      }
      options.headers.set("Authorization", localStorage.getItem("id_token"))
    }
    return options;
  }


  request(url: string|Request, options?: RequestOptionsArgs): Observable<Response> {
    options = this._setCustomHeaders(options);
    return super.request(url, options)
  }
}

然后在我的应用程序提供者中，我可以使用自定义工厂来提供“Http”

import { RequestOptions, Http, XHRBackend} from '@angular/http';
import {HttpClient} from './httpClient';
import { RequestOptions, Http, XHRBackend} from '@angular/http';
import {HttpClient} from './httpClient';//above snippet

function httpClientFactory(xhrBackend: XHRBackend, requestOptions: RequestOptions): Http {
  return new HttpClient(xhrBackend, requestOptions);
}

@NgModule({
  imports:[
    FormsModule,
    BrowserModule,
  ],
  declarations: APP_DECLARATIONS,
  bootstrap:[AppComponent],
  providers:[
     { provide: Http, useFactory: httpClientFactory, deps: [XHRBackend, RequestOptions]}
  ],
})
export class AppModule {
  constructor(){

  }
}

现在我不需要声明每个Http方法，可以在整个应用程序中正常使用Http。

你可以在你的路由中使用canActive，如下所示:

import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { CanActivate } from '@angular/router';
import { AuthService } from './auth.service';

@Injectable()
export class AuthGuard implements CanActivate {

  constructor(private auth: AuthService, private router: Router) {}

  canActivate() {
    // If user is not logged in we'll send them to the homepage 
    if (!this.auth.loggedIn()) {
      this.router.navigate(['']);
      return false;
    }
    return true;
  }

}

const appRoutes: Routes = [
  {
    path: '', redirectTo: '/deals', pathMatch: 'full'
  },
  {
    path: 'special',
    component: PrivateDealsComponent,
    /* We'll use the canActivate API and pass in our AuthGuard.
       Now any time the /special route is hit, the AuthGuard will run
       first to make sure the user is logged in before activating and
       loading this route. */
    canActivate: [AuthGuard]
  }
];

摘自:https://auth0.com/blog/angular-2-authentication

const headers = new HttpHeaders()
  .set('content-type', 'application/json')
  .set('x-functions-key', '');

return this.http.get<Person[]>(baseUrl, {
      headers: headers,
    });

使用append方法将新值附加到现有值集

headers.append('Access-Control-Allow-Origin', '*')

最简单的

创建配置。ts文件

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

export class Config {
    url: string = 'http://localhost:3000';
    httpOptions: any = {
        headers: new HttpHeaders({
           'Content-Type': 'application/json',
           'Authorization': JSON.parse(localStorage.getItem('currentUser')).token
        })
    }
}

然后在你的服务上，导入配置。ts文件

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

@Injectable()
export class OrganizationService {
  config = new Config;

  constructor(
    private http: HttpClient
  ) { }

  addData(data): Observable<any> {
     let sendAddLink = `${this.config.url}/api/addData`;

     return this.http.post(sendAddLink , data, this.config.httpOptions).pipe(
       tap(snap => {
      return snap;
        })
    );
 } 

我认为这是最简单和最安全的。