为什么角度更改我的get请求url

当我在angular中使用httpclient服务时,我发现httpclient更改了我的get请求url。

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

const objeniousApiKey = '...';
const objeniousRootUri = 'https://api.objenious.com/v1';

@Injectable()
export class ObjeniousRestProvider {

  constructor(public http: HttpClient) {
  }

  get(route: string, params?: HttpParams, headers ?: HttpHeaders): Observable<any> {
    if (!headers) {
      headers = new HttpHeaders();
    }

    headers = headers.set('apiKey', objeniousApiKey);

    return this.http.get(objeniousRootUri + route, {headers, params});
  }


  getSystemStatesList(commaSeparatedSystemIds: string): Observable<any> {
// This does not work  (first method)
    return this.http.get(`/devices/states?id=3940649673951919,3940649673951920`);


// This works  (second method)
    // let headers = new HttpHeaders().set('apiKey', objeniousApiKey);
    // return this.http.get('https://api.objenious.com/v1/devices/states?id=3940649673951919,3940649673951920', {headers});
  }
}

当我使用第一个方法时,rest api调用不起作用,我试图在chrome(使用开发工具)中找到这不起作用的原因。我发现Angular将我的get请求url更改为 "http://localhost:8100/devices/states?id=3940649673951919,3940649673951920" ,但不应该是 "https://api.objenious.com/v1/devices/states?id=3940649673951919,3940649673951920" 是吗?

当我尝试第二种方法时,一切都很好。