angular – cors-anywhere.herokuapp.com无法正常工作(503).我还

我正在尝试向Wikipedia API发送get请求.我发送请求形式一个角度前端所以我正在尝试使用Heroku CORS Anywhere端点来避免CORS问题.出于某种原因,我仍然得到503响应,表示请求的资源上没有access-control-allow-origin报头.知道为什么会发生这种情况/我还能尝试什么？

我的代码：

import { Injectable } from '@angular/core';
import { Http,Response,} from '@angular/http';
import { Observable } from 'rxjs/Rx';



@Injectable()
export class RestService {
    API_URL: string = 'https://cors-anywhere.herokuapp.com/https://en.wikipedia.org/wiki/';

  constructor(private http: Http) { }

  public getRandomArticle() : Observable<any> {
        return this.http.get(`${this.API_URL}Special:Random`)
        .map((res: Response) => res.json())
        .catch((err: any) => Observable.throw(err || 'server error'));
  }

}

git clone https://github.com/Rob--W/cors-anywhere.git
cd cors-anywhere/
npm install
heroku create
git push heroku master