http - Angular2 不发送 HTTP GET

Question

(A) 中列出的代码在 test() 被调用时从不发送其 HTTP 请求，而 (B) 中几乎相同的代码确实有效。知道问题是什么吗？我通过查看服务器日志知道是否发送了请求。此外，如果我通过将请求粘贴到浏览器中手动发出 (A) 中的请求，我会得到预期的响应。我很难过!

(一)

import { Constants } from '../toplevel/constants'

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

import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';


@Injectable()
export class SigninService {

  constructor (private http: Http, private constants : Constants) {

  }

  getToken(username: string, password: string) : Observable<string>{

    var url = `${this.constants.apiRoot}/users/${username}?${password}`

    console.log(`Calling api server with url ${url}`)

    return this.http.get(url)
      .map((res:Response) => JSON.stringify(res.json()))
      .catch((error:any) => Observable.throw(error.json().error || 'Server error'));

  }

 test() {

   this.getToken('jc', 'yadayada')
 }
}

(B:节选)

getDocument(id: string) : Observable<Document>{
  return this.http.get(`${this.apiUrl}/documents/${id}`)
  .map((res:Response) => new Document(res.json()['document']))
  .catch((error:any) => Observable.throw(error.json().error || 'Server error'));

  }

Answer 1

你的序列很冷。您需要将测试更改为:

   this.getToken('jc', 'yadayada').subscribe()

激活它并发送请求