error handler interceptor

 import { Injectable } from '@angular/core';

import {

  HttpRequest,

  HttpHandler,

  HttpEvent,

  HttpInterceptor

} from '@angular/common/http';

import { Observable, throwError } from 'rxjs';

import { catchError } from 'rxjs/operators';

import { LoginService } from '../Services/login.service';

@Injectable()

export class ErrorInterceptor implements HttpInterceptor {

  constructor(private loginService:LoginService) {}

  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {

    return next.handle(request).pipe(catchError(err => {

        if ([401, 403].indexOf(err.status) !== -1) {

            // auto logout if 401 Unauthorized or 403 Forbidden response returned from api

            this.loginService.logout();

           // location.reload(true);

        }

        //const error = err.error.message || err.statusText;

        const error = err.status;

        return throwError(error);

    }))

}

}

app.module.ts

----------------

providers: [

               { provide: HTTP_INTERCEPTORS, useClass: ErrorInterceptor, multi: true },],