angular http error handling

1    // src/app/services/interceptor.service.ts
2    import { Injectable } from '@angular/core';
3    import {
4    HttpInterceptor, HttpRequest,
5    HttpHandler, HttpEvent, HttpErrorResponse
6    } from '@angular/common/http';
7    import { Observable, throwError } from 'rxjs';
8    import { catchError } from 'rxjs/operators';
9    @Injectable({
10    providedIn: 'root'
11    })
12    export class InterceptorService implements HttpInterceptor{
13     constructor() { }
14     handleError(error: HttpErrorResponse){
15      console.log("lalalalalalalala");
16      return throwError(error);
17     }
18    intercept(req: HttpRequest<any>, next: HttpHandler):
19    Observable<HttpEvent<any>>{
20     return next.handle(req)
21     .pipe(
22      catchError(this.handleError)
23     )
24     };
25    }