找不到HTTPS Params Angle 7错误404

Question

我在这里想念什么？没有找回正确的网址，未正确显示经纬度，我收到404 not found错误。

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

import { Observable } from 'rxjs';
import * as constants from '../../src/app/constants/constants';



@Injectable()


export class ForecastService {

   url = `https://cors-anywhere.herokuapp.com/https://api.darksky.net/forecast/${constants.DARKSKY_API_KEY}/`;

  constructor(private http: HttpClient) {}


  getForecastData(lat: number, lng: number): Observable<any>  {
    let params = new HttpParams()
    params = params.set('lat', lat.toString() )
    params = params.set('lng', lng.toString() )
    console.log(lat,lng)

    return this.http.get(this.url, {params:params})


  }
}

我得到的是错误： HttpErrorResponse {标题：HttpHeaders，状态：404，statusText：“未找到”，网址：“ cors-anywhere.herokuapp.com / https://api.da……2823eaa6089 /？lat = 52.025137099999995＆lng = 5.0709602” –