Angular2 Extend Service

I want to extend an existing angular service (in this example Http

).

Requirements:

• Service Extension is handled through Angle Dependency Injection
• It should be possible to renew the service several times (for example, as the Decorator Pattern allows )
• The generated object should implement (if possible) or extend Http
  
  so that existing code does not need to be changed. DI introduces "decorated" Http
  
  .
• One possible use case would be Http
  
  "decorated" SecureHttp
  
  and LoggingHttp
  
  .

I'm tired so far:

• SecureHttp implements Http
  
  doesn't seem to work because 1.is Http
  
  not an interface and 2.it is protected by members that need to be implemented

• Extend Http

  class SecureHttp extends Http {
    constructor(_backend: ConnectionBackend, _defaultOptions: RequestOptions, private _http: Http){
      super(_backend, _defaultOptions);
    }
  
    get(url: string, options?: RequestOptionsArgs): Observable<Response> {
      console.log("This is secure Http.");
      return this._http.get(url, options);
    }
  ...
  }
  
        
  
          
          
          
        
  
      

  But I don't know how to provide the service, so it Http
  
  is injected by the class SecureHttp
  
  , but Http
  
  in it SecureHttp
  
  gets injected Http
  
  .

Am I on the right track?

Or are there other concepts in angular2 that allow you to extend existing services that I am not aware of?