How to find network disconnected error in angular 2+

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Angular5

I try to find network disconnected issue. I have tried multiple ways. Still i didn't get the solution. I could not achieve with status code.


Here is my sample code:

var headers = new Headers();
    headers.append('Content-Type', 'application/json');
    headers.append('Authorization', 'Bearer ' + this.token); 

    this.http.get('http://someurl/'+userId,{headers:headers})

    .map(res => res.json())

    .subscribe(
      data => {
      console.log(data);
     },

    error => {
      console.log(error);
      if(error.status == 500) {
        this.dashResponse = false;
        this.notFoundResponse = false;
        this.serverErrorResponse = true;
      }
      else if(error.status == 404)
      {
        this.dashResponse = false;
        this.notFoundResponse = true;
        this.serverErrorResponse = false;
      }
      else if(error.status == 401)
      {
        this.router.navigate(['/login']);
        alert('Un Authorized');
        this.refresh();
      }
      else
      {
        this.dashResponse = false;
        this.notFoundResponse = false;
        this.serverErrorResponse = true;
      }
    }

     );

Can any one solve my problem ?. Thanks in Advance.

What I have tried:

I want to display Network Disconnected Alert. I want to get the Error in console. But, i did not get the solution.