Angular 6 http请求处理(Angular 6 http request handling)

 我正在使用Angular 6构建一个Web应用程序。我有一个服务，它有一个方法，当它被调用并给出正确的参数时，向服务器发送POST请求并返回数据。 这是方法： 
 
  public getDataFromServer(request, url): any {
      return this.httpClient.post(url, request, {headers: new HttpHeaders().set(this.headername, this.header ) });
  }
 
 现在我有多个使用此方法的组件。 菜单中的每个页面（ 家庭，关于，新闻等）都使用这个。 我想创建一个请求处理程序，它将发送第一个请求（假设我登录），然后等待，直到我收到响应，然后再发送另一个请求。 如果我点击页面新闻 ，然后在页面上点击，我会得到回复，我已经在网页上，并在我得到回应后，下一个请求将成为页面新闻上的一个，但我已经在网页上。 如果我在网页上，我不希望要求新闻被执行。 
 
 我看到一些使用http拦截器的帖子，但我不希望请求甚至会被发送到http。 请求不得发送。 提前谢谢你的帮助。 

I'm building a web app using Angular 6. I have a service that has a method which when called and given right parameters, sends a POST request to the server and returns the data. This is the method:
 
  public getDataFromServer(request, url): any {
      return this.httpClient.post(url, request, {headers: new HttpHeaders().set(this.headername, this.header ) });
  }
 
Now I have multiple components which uses this method. Every page in the menu (home, about, news, etc..) uses this. I want to make a request handler that would send the first request (let's say I login) and then wait until I get a response before sending another request. If I were to click on page news and then on page about before I would get response, I would already be on page about and after I get response the next request will be the one on page news, but I'm already on page about. I don't want request on news to be executed if I'm on page about.
 
I saw some posts with http interceptor, but I don't want the request to even be made to http. Request must not be sent. Thank you for your help in advance.

原文：https://stackoverflow.com/questions/50945066